Please see attached images of the Sherman outside 3 Div HQ as of April this year. I can confirm it still has an engine, or at least a large rust-coloured metal lump in the engine bay, as the rear doors are partially open.
The HQ also used to have a Russian Zis-3 76mm field gun (donated by the Afghan MoD in 2002) outside, however it had been removed shortly before I left, possibly for cosmetic restoration as it was looking a little sorry for itself.