Hi Ian, that actually belongs to me. I acquired it about thirty years ago when the caretaker of a technical school in Colchester contacted me as they were having a clear out and this was going in the skip. However, for a donation to the school I could have it. I was told it came from the RASC training school at Colchester barracks where it was made from a scrap engine.
It was quite incomplete but worth the trip. I stripped, cleaned and repainted what there was. I sectioned the magdyno carb and oil pump myself to finish it off.