1 MOUNTING ASSEMBLY FOR PUMP BODY Technical Field A mounting assembly for a pump body is disclosed. Particularly, though not exclusively, a mounting assembly for a pump body used in subsurface dewatering operations is disclosed. Background Dewatering is the removal or drainage of groundwater or surface water from surface or sub-surface excavation, earthworks, caissons or mine shafts. Typically, this frequently involves the use of submersible pumps, centrifugal pumps, positive displacement pumps, eductors and, less frequently, the application of vacuum to remove and transport the water via conduits to one or more storage locations. In sub-surface operations, there may be several dewatering pumps operating at appropriate locations underground interconnected by a network of conduits. Each of these pumps requires servicing and maintenance every 3-6 months. Generally, to comply with occupational health and safety requirements, there is a need to transport the pump to an above ground off-site service centre where the pump can be serviced. Before removing the pump body for servicing, it must be unbolted from its base and disconnected from its motor. This can be a time consuming and difficult exercise, 7385770_1 (GHMatters) P98482.AU.1 ANDREAS 2 particularly in the dirty conditions normally experienced underground, where the bolts may have corroded or become stuck fast with mud and grit. Furthermore, the pump body that has been removed for servicing needs to be replaced immediately with another pump body so that underground dewatering operations can continue. Consequently, there is duplication in the manual labour and time associated with re-bolting the replacement pump body back onto the base and re-connecting it to the motor. Moreover, the pump body is cumbersome to lift and transport. There is a need for a mounting assembly for a pump body which allows the pump body to be readily transported and quickly disconnected from its base and motor to minimise double-handling. The above references to background art do not constitute an admission that the art forms a part of the common general knowledge of a person of ordinary skill in the art. The above references are also not intended to limit the application of the apparatus and system as disclosed herein. Summary Generally, a mounting assembly for a pump body is disclosed. The mounting assembly for a pump body comprises: a base unit; 7385770_1 (GHMatters) P98482.AU.1 ANDREAS 3 a cassette unit removably fixed to the base unit, the cassette unit being configured for the pump body to be mounted thereon; and, a latching unit configured to urge the cassette unit into a fixed position with respect to the base unit. In one embodiment the base unit comprises a skid base. The base unit may be provided with one or more surfaces for supporting the cassette unit thereon and one or more restrainers configured, in use, to communicate with the cassette unit in a manner to fix the cassette unit with respect to the base unit. For example, the one or more restrainers may engage the cassette unit in a friction fit. Alternatively, or additionally, the one or more restrainers may restrain upward vertical movement of the cassette unit relative to the base unit. The one or more restrainers may also restrain lateral movement of the cassette unit relative to the base unit. The restrainer may take the form of a lug upwardly extending from the support surface of the base unit. The lug may be provided with one or more mating surfaces which are complementarily disposed with respect to the cassette unit to form a friction fit therewith. Alternatively, or additionally, the lug may be shaped to restrain upward vertical movement of the cassette unit relative to the base unit and, optionally, to restrain lateral movement of the cassette unit relative to the base unit. The cassette unit comprises an elongate member having one or more surfaces for mounting the pump body thereon. The elongate member also has a first lateral surface and an 7385770_1 (GHMatters) P98482.AU.1 ANDREAS 4 opposite second lateral surface. In use, the second lateral surface is arranged to communicate with the latching unit in a manner to urge the cassette unit in a lateral direction so that the first lateral surface is engaged by the restrainer of the base unit thereby fixing the cassette unit relative to the base unit. In one embodiment, the first and second lateral surfaces, respectively, are tapered. In one embodiment the latching unit comprises a wedge member having a tapered surface configured for communication with the cassette unit, in particular the second lateral surface of the cassette unit. The wedge member is configured to be detachably engaged with the base unit in a manner whereby engagement of the wedge member with the base unit causes the tapered surface of the wedge member to abut the tapered second lateral surface of the cassette unit and urge the cassette unit in a lateral direction so that the first lateral surface of the cassette unit engages the one or more restrainers, thereby fixing the cassette unit with respect to the base unit. Detachment of the wedge member from the base unit disengages the cassette unit from the one or more restrainers of the base unit, thereby allowing the cassette unit with the pump body mounted thereon to be removed from the base unit. In one alternative embodiment, the latching unit may comprise an eccentric cam device configured, in use, to communicate with the cassette unit in a manner to urge the cassette unit to engage the one or more restrainers of the 7385770_1 (GHMatters) P98482.AU.1 ANDREAS 5 base unit, thereby fixing the cassette unit with respect to the base unit. In another alternative embodiment, the latching unit may comprise a clamp, in the form of a toggle clamp or a latching clamp. The clamp may be configured to communicate with the cassette unit in a manner to urge the cassette unit to engage the one or more restrainers of the base unit, thereby fixing the cassette unit with respect to the base unit. Description of the Figures Notwithstanding any other forms which may fall within the scope of the mounting assembly for a pump body as set forth in the Summary, specific embodiments will now be described, by way of example only, with reference to the accompanying drawings in which: Figure 1 is a schematic representation of a perspective view of one embodiment of a mounting assembly for a pump body, with the pump body mounted on a cassette unit of the mounting assembly, in accordance with the disclosure; Figure 2 is a perspective view of one embodiment of a base unit of the mounting assembly shown in Figure 1; Figure 3 is a perspective view of one embodiment of a cassette unit of the mounting assembly shown in Figure 1; Figure 4 is a perspective view of one embodiment of a 7385770_1 (GHMatters) P98482.AU.1 ANDREAS 6 latching unit of the mounting assembly shown in Figure 1; Figure 5 is a perspective view of an alternative embodiment of a latching unit of the mounting assembly shown in Figure 1; Figure 6 is a cross-sectional view of the mounting assembly in accordance with the disclosure showing the cassette unit in a fixed position relative to the base unit by engagement with the latching unit shown in Figure 5; and Figure 7 is a cross-sectional view of the mounting assembly in accordance with the disclosure showing the cassette unit in a fixed position relative to the base unit by engagement with the latching unit shown in Figure 4. Detailed Description of Specific Embodiments Embodiments of a mounting assembly for a pump body will now be described by way of example only, and with particular (though not exclusive) reference to a positive displacement pump body used in subsurface dewatering operations. Referring to the figures there is shown a mounting assembly 10 for a pump body 100. The mounting assembly 10 includes a base unit 12, a cassette unit 14 and a latching unit 16. 7385770_1 (GHMatters) P98482.AU.1 ANDREAS 7 Base unit In this particular embodiment, the base unit 12 is a skid base comprising a pair of parallel elongate members 18 having a ground engaging surface 20 and an upper surface 22, and a plurality of lateral sections 24 interconnecting the parallel elongate members 18. The lateral sections 24 shown in the figures are C sections. Alternatively, the lateral sections 24 may take the form of I-beams, H-beams, box sections, rectangular hollow sections (RHS), and so forth. The lateral sections 24 improve the rigidity and strength of the skid base. Generally, the lateral sections 24 are disposed relative to the parallel elongate members 18 such that respective upper surfaces 26 of the lateral sections 24 are substantially aligned with respective upper surfaces 22 of the parallel elongate members 18 and with one another. In use, the upper surfaces 26 of the lateral sections 24 support the cassette unit 14 thereon. The base unit 12 includes a plurality of restrainers 28. The restrainers 28 may take the form of respective lugs 30 upwardly extending from the lateral sections 24. As shown in the figures, the lugs 30 are fixed to respective vertical surfaces 32 of the lateral sections 24 at an angle a with respect to the upper surfaces 26 of the lateral sections 24. The lugs 30 are configured, in use, to communicate with the cassette unit 14 in a manner, as will be described later, to fix the cassette unit 14 with respect to the 7385770_1 (GHMatters) P98482.AU.1 ANDREAS 8 base unit 12. In this particular embodiment the lugs 30 are adapted to engage the cassette unit 14 in a friction fit and to restrain upward vertical movement of the cassette unit 14 relative to the base unit 12. The lugs 30 also restrain lateral movement of the cassette unit 14 along the lateral sections 24 of the base unit 12. In other words, the lugs 30 behave as stop members which halt any further lateral movement of the cassette unit 14 along the lateral sections 24 of the base unit 12. Therefore it will be appreciated that placement of the lugs 30 on the lateral sections 24 will depend on the effective width of the cassette unit 14 relative to the base unit 12 The base unit 12 may also be configured to engage the latching unit 16. In this particular embodiment, one of the parallel elongate members 18a is provided with a plurality of lugs 34 upstanding from the upper surface 22. Each lug 34 is laterally aligned with the respective lateral section 24. In use, the lug 34 engages the latching unit 16 as will be described later. Accordingly, the lug 34 may take various forms in order to engage the latching unit 16. For example, the lug 34 may have angled side surfaces, as shown in Figure 6. Alternatively, the lug 34 may be substantially vertical, as shown in Figure 7. The base unit 12 may be adapted to be transportable. For example, the parallel elongate members 18 may be provided with a plurality of padeyes 36 to enable the base unit 12 to be hitched to lifting or hauling equipment. The padeyes 36 are disposed proximal to respective ends 38 of the parallel elongate members 18. 7385770_1 (GHMatters) P98482.AU.1 ANDREAS 9 As shown in the figures, the ground engaging surface 20 of the elongate members 18 taper towards the upper surface 22 of the elongate members 18 at respective ends 38 thereof, so that if the base unit 12 is dragged along the subsurface floor (of a mine), the ends 38 of the base unit 12 will not substantially impede its progress if the base unit 12 is slightly tilted. Furthermore, in this particular embodiment, the base unit 12 may be specifically adapted to be capable of being engaged by a fork of a forklift vehicle. The adaptation may take the form of a pair of hollow box sections 40 disposed between the parallel elongate members 18 and spaced apart from one another at a distance to receive a pair of fork tines of the forklift vehicle. The pair of hollow box sections 40 may be positioned substantially equidistantly between respective ends 38 of the elongate members 18 so that the weight of the base unit 12 is substantially evenly balanced on either side of the pair of fork tines when received in the pair of hollow box sections 40. The base unit 12 may also be adapted to support a motor 200 for the pump body 100. The base unit 12 may include a motor support 42 comprising a plate member 44 for supporting the motor mounted on a plurality of leg members 46. Cassette unit The cassette unit 14 is configured for the pump body 100 to be mounted thereon. Furthermore, the cassette unit 14 is removably fixed to the base unit 12. In this way, the 7385770_1 (GHMatters) P98482.AU.1 ANDREAS 10 cassette unit 14 and the pump body 100 mounted thereto may be quickly released from, or quickly fixed to, the base unit 12. The cassette unit 14 comprises is generally an elongate member 48 comprised of a pair of parallel elongate members 50 having a first lateral surface 52 and an opposite second lateral surface 54, and a plurality of lateral sections 56 interconnecting the parallel elongate members 50 at spaced intervals therealong. The lateral sections 56 are substantially aligned with an upper surface 58 of the elongate member 48. As shown in the figures, the lateral sections 56 are provided with a plurality of bolt holes with which to affix the pump body 100 to the cassette unit 14. In use, the second lateral surface 54 is arranged to communicate with the latching unit 16 in a manner to urge the cassette unit 14 in a lateral direction toward the restrainers 28 of the base unit 12 so that the first lateral surface 52 is engaged by the restrainers 28 of the base unit 12 thereby fixing the cassette unit 14 relative to the base unit 12. In the embodiment shown in the figures, the pair of parallel elongate members 50 are angle irons. Accordingly, the first lateral surface 52 and the opposite second lateral surface 54 are outwardly tapered, respectively, at angle a. The first lateral surface 52 is outwardly tapered at the same angle a as the lug 30. Consequently, the lug 30 has 7385770_1 (GHMatters) P98482.AU.1 ANDREAS 11 a side surface 60 which is complementarily disposed with respect to the first lateral surface 52. In use, when the cassette unit 14 is translated laterally along the lateral sections 24 of the base unit 12, the side surface 60 and the first lateral surface 52 are capable of forming a friction fit when the first lateral surface 52 mates with or abuts the side surface 60 of the lug 30. The lug 30 also restrains further lateral movement of the cassette unit 14 beyond the lug 30 with respect to the base unit 12. In this particular embodiment, the lug 30 also restrains upward vertical movement of the elongate member 48 of the cassette unit 14 relative to the base unit 12 because the lug 30 overhangs the first lateral surface 52 when the first lateral surface 52 mates with or abuts the side surface 60 of the lug 30. The cassette unit 12 may be specifically adapted to be capable of being engaged by a fork of a forklift vehicle and thereby transportable. The adaptation may take the form of a pair of hollow box sections 61 disposed between the parallel elongate members 50 on the upper surface 58 of the parallel elongate members 50. The pair of hollow box sections 61are spaced apart from one another at a distance to receive a pair of fork tines of the forklift vehicle. The pair of hollow box sections 61 may be positioned substantially equidistantly between respective ends of the elongate members 50 so that the weight of the cassette unit 14 and the pump body 100 mounted thereto is substantially evenly balanced on either side of the pair of fork tines when received in the pair of hollow box sections 61. It will be appreciated that the cassette unit 12 and the pump body 100 mounted thereto may only be 7385770_1 (GHMatters) P98482.AU.1 ANDREAS 12 removed and lifted from the base unit 12 by means of a forklift vehicle when the cassette unit 12 is not in the fixed position. Latching unit In use, the latching unit 16 is configured to urge the cassette unit 14 into a fixed position with respect to the base unit 12. As shown in the figures, the latching unit 16 may comprise a wedge member 62. The wedge member 62 has an upper surface 64, a lower surface 66, a first side surface 68 and an opposite second side surface 70. The first side surface 68 of the wedge member 62 is complementarily disposed with respect to, and for communication with, the lug 34 of the base unit 12. In the embodiment shown in Figure 4, the first side surface 68 is vertical for communication with the vertical lug 34, as shown in Figure 6. In the alternative embodiment shown in Figure 5, the first side surface 68 is inclined or tapered for communication with the tapered or inclined lug 34, as shown in Figure 7. The wedge member 62 may be fixed to the parallel elongate member 18a of the base unit 12 at a desired position by suitable fastening means. For example, as shown in the figures, the wedge member 62 is provided with a bolt hole extending through the body of the wedge member 62 from the upper surface 64 to the lower surface 66. The bolt hole receives a bolt to fix the wedge member 62 to the upper surface 22 of the first elongate member 18a. The wedge 7385770_1 (GHMatters) P98482.AU.1 ANDREAS 13 member 62 can be detached from the base unit 12 by removing the bolt from the bolt hold. The second side surface 70 is tapered at angle a such that the upper surface 64 is longer than the lower surface 66. The second side surface 70 is tapered at the same angle a as the second lateral surface 54 of the cassette unit 14. Consequently, the second side surface 70 of the wedge member 62 is complementarily disposed with respect to, and for communication with, the second lateral surface 54 of the cassette unit 14. In use, engagement of the wedge member 62 with the base unit 12 as described above causes the tapered second side surface 70 of the wedge member 62 to abut the tapered second lateral surface 54 of the cassette unit 14 and urge the cassette unit 14 in a lateral direction so that the first lateral surface 52 of the cassette unit 14 engages the one or more restrainers 28, thereby fixing the cassette unit 14 with respect to the base unit 12. Detachment of the wedge member 62 from the base unit 12 disengages the cassette unit 14 from the one or more restrainers 28 of the base unit 12, thereby allowing the cassette unit 14 with the pump body 100 mounted thereon to be removed from the base unit 12. Additionally, the tapered second side surface 70 of the wedge member 62 also restrains upward vertical movement of the elongate member 48 of the cassette unit 14 relative to the base unit 12 because the wedge member 62 overhangs the second lateral surface 54 when the second lateral surface 54 communicates with the second side surface 70 of the 7385770_1 (GHMatters) P98482.AU.1 ANDREAS 14 wedge member 62. Embodiments of the mounting assembly 10 may be fabricated from metal such as aluminium or steel, or alloys thereof, and may comprise polymeric components such as injection moulded plastic materials. It will be appreciated that the various parts of the mounting assembly 10 may be galvanised before or after fabrication. Numerous variations and modifications will suggest themselves to persons skilled in the relevant art, in addition to those already described, without departing from the disclosure. All such variations and modifications are to be considered within the scope of the disclosure. In the claims which follow, and in the preceding description, except where the context requires otherwise due to express language or necessary implication, the word "comprise" and variations such as "comprises" or "comprising" are used in an inclusive sense, i.e. to specify the presence of the stated features but not to preclude the presence or addition of further features in various embodiments of the apparatus and method as disclosed herein. 7385770_1 (GHMatters) P98482.AU.1 ANDREAS