I must admit, I don't recall seeing it either, which is one of the reasons I took the pic at the time.
I've been trying to find a relevant pic of the UK airworthy Fury ( should have loads), to see if it's fitted to that aircraft, but my wrists are so stiff and painful, it hurts to use the mouse to scroll through all the folders !
Either way, the Brooklands Fury is supposed to be externally accurate (internal construction used ex-Wellington alloy frames !), so I guess the generator was there at some point.
EDIT : Just checked my pics of the Duxford Fury, and it ain't fitted. Apologies if this has mislead anyone !