260 and 261 Church Road
Borough of Mitcham List of Factories,
Town Clerk’s Department,
Available at Merton Heritage and Local Studies Centre at Morden Library.
Reference L2 (670) MIT
History of the company, from its website in 2016:
1921 Rototherm invents bi-metallic thermometer
1934 moves to factory in Merton Abbey
1969 moves to new factory in Port Talbot, Wales
See also Grace’s Guide.