Maplin used to be ideal when it was more aimed at electronics hobbyists, ie. before it became a copy of Tandy selling radio control cars and clocks.
At the head office at Wombwell (near Barnsley for any southerners out there) they had a trade counter that the public could use (if that makes sense!?).
The catalogue used to be a good source of reference as well. In the days when it had pages and pages of IC data, etc. ie. before it became a glossy Tandy catalogue full of radio control cars and clocks.
And don't forget the excellent artwork on the covers.
I've done reminiscing now!