Pedler,
The Science Museum is long gone, replaced by The Think Tank a modern technology exhibition site.I believe some of the guns may be in the Proof House Collection, but allegedly the better exhibits were taken for safe keeping by the Museum Governors and the 'favoured few'.Mike Newland the former curator of the gun collection, historian and writer is a good friend of mine.He seeths with rage if you ask him where the collection is, swears, and says that I should do something about it.I did but met a wall of silence.
Fancy you working at GKN! I used to prepare a race car for one of the development engineers there at Heath Street. Geoff Williams was his name, he passed away last year.Also was instrumental in building the GKN 48D which was a Europa with a Rover / Buick V8. I tell you it is a very small world.