That's brilliant Phil.
The theory completely makes sense and brilliant you could nail it to a window of around 15 yrs.
Just when I think there are no more pictures you pull one out of the bag, fantastic.
I'm supposed to be having a look around the building with the landlord in the next week, as he knows I am interested in the history of it. (The same company benacre properties, who own our shop, own it, incidentally the same outfit who own the land where Kent St baths was, and contravertially pulled it down in 2009, so I read, please correct me if I'm wrong) They are on the verge of tearing it apart at the moment, there was a large asbestos roofed out building which has just been pulled down, you can actually get on the roof from inside, might try and have a look see what might have happened. Without falling off of course! Hopefully I can find some evidence of times gone by. Will keep you posted.
Cheers
Shah