Bond's O' Euston Road
I have in my collection two catalogues from the early 1930's from this famous modelling supplies company - they make fascinating reading, and lists lots of the toys we like so much today: Bowman and Stuart engines, Bing and Hornby trains, Meccano sets, you name it! If anyone is after any particular brand, let me know, I'll check if it's there and if so send you a scan. Images below are actual size.

Stationary Steam Engines

Live Steam Locos

Live Steam Boats