Alan is correct, either Morris or Guy FAT, still waiting for a kit to come out though!!!
Dragon MkIII was used mostly with the 18/25pdr, Dragon MkII for the 2pdr.
There was also the Morris CDSW "Toast-rack", a lot were photographed abandoned in France, and they became obsolete after 1940, though there may have been a few in NA. Some went to Ireland, there are a couple of restored ones about.
george