A few year ago, David Busfield started a thread probably on TMT . This was about the suppliers of Meccano Ltd.
Today, the list is as follows for Meccano Ltd :
Pinions for Elevator loader : John Righby & Sons of Birmingham (not the gun maker)
Birmingham Eng. Co. Ltd.
Chains for Foden Birmingham Associated Chains Ltd.
Aluminium castings Birmingham Aluminium Casting Company
Dies Thomas Keating of Billingshurst (Sussex)
For Meccano s.a. :
Plastic parts Ets. Bourgeois
Tyres Le Joint Français
Paints Herberts Hadfields
Mock-up and master models Ets. Monnier Paris
Figures and petrol pumps Fonderie Roger
Can you add any more ?