Ian, it's a beautifully constructed model from Mike's range (not by me, I hasten to add!) and works like a Swiss watch.
Taken from the Judith Edge Kits site:
LMS/BR Jackshaft drive 0-6-0DE
This kit will build LMS 71OO-9 or BR 12023-32 and represents the final batch of ten single motor 350hp 0-6-0 diesel electric shunters built by the LMS at Derby in 1942. LMS 71OO9 were built to the same design but went to the War Department for service overseas, in the Middle East, Egypt and eventually Italy. The locos were originally painted black and all passed to British Railways in