Kev
I have the following info from Peter Laidler;
(all UK I assume)
Austin Motor Co. M13, parts, assy.
BSA M47, parts
Best & Lloyd M30, drum winding handles
C&H Bevens Ltd, drum adapter brackets
Broadbent & Co N14, springs
Dernier & Hamlyn, drum winding handles
ESS Signs S223, parts, assy.
Elkington & Co M78, parts, assy.
Gillette Industries, springs
Gimson & Slater M635, springs
Godins (Newport) Ltd M91, parts, assy.
V&N Hartley N29, parts, assy.
Arthur Heaton & Co N179, platforms
Hindle Automotive Products M178, platforms
Howard Wall S123, parts, assy.
Hugh Campbell S167, drum winding handle
Invicta Springs N175, drum springs
Willen Jones & Sons M136, platforms
Lines Bros S68, drum parts
Meccano Ltd, drum rivets
Prince-Smith & Stells N56, platforms
Sigmund Pulsometer Pump Co N65, drum parts
Unity Heating Co S365, parts, assy.
Vickers Armstrong (Bath) S121, drum parts
Waygood Otis Ltd S292, drum parts
Wilson & Mathieson N90, drum parts
Mags were made in Aussie by Lithgow (scarce) and also by Electrolux, and possibly others.
I hope this helps