How about Bellis & Morcom; Woseley; (the proper) Kalamazoo; Taylor and Challon; Metro-Cammell Weymann; Norton, Aerial, Vincent, Vellocette; are Hardy Spicer or GKN still manufacturing in Brum - I think they might be?
Birmingham Battery & Metal Co. Limited, Midland Railway, Carriage & Wagon Company, Elliots of Selly Oak; M&B; Ansells, Atkinson's, Davenports...
Phew!