Pics suggest it extends "1 bay" (From pole to pole) which in my limited experience is likely to be around 1.4m (at roof level). The sloping front down to the ground would maybe add a further 0.6m at floor level, so 2m of floor space. "Give or take an inch or two", as they say!
Amazing family weekend with old steam engines, classic car displays, market stalls, and full catering and bar. And camping on site - Save £25 by booking in advance.