Hmmmmm I remember something about this.
The very first cash machine was installed in a London bank (Barclays springs to mind as I'm sure it was mentioned in one of their adverts at some point). As to who used it first, apart from the installer to test it ;-) Probably someone famous or a director of the bank itself?
on the right track - I know I didn't specify, but I'd like a little more detail rather than London... town is sufficient, not lat/long!
and yes, its someone famous, not the bank director, manager, or someone like that.
PS - yes, it was Barclays, but I decided not to ask that bit!
Reg Varney was the famous person, but i don't know where in london