A rotational moulding machine comprises an oven, at least one arm arranged, in use, to rotate a mould within and relative to oven. It has a connection portion for connecting mould to arm and a cabling receiving section for receiving cabling connected between outside of oven and connection portion. A first conduit portion for the flow therein of cooling fluid from outside of oven into oven towards connection portion, and a second conduit portion for the return flow there along of cooling fluid from inside of oven to outside of oven. It utilizes a pump for pumping cooling fluid through first and second conduit portions. The pumped flow of cooling fluid through first and second conduit portions serves to cool connection portion and/or cabling receiving section.