Capt Belcher is probably from the later BMA days. He occasionally pops up on here, and may have contacts with other folks from that era.
There's also a quarterly get-together of "BMA Old-Timers" at the Sun Inn, Gotham (formerly run by my late uncle and ex-Midland engineering inspector, Dick Chester). The group consists mainly of engineers, with a smattering of crews.
Meanwhile, a couple of images that may be of interest...
burnaston | Flickr - Photo Sharing!
Derby Airways Dakota G-AMSX | Flickr - Photo Sharing!
G-ALHG Canadair C-4 Argonaut Derby Aws LPL 26MAR64 | Flickr - Photo Sharing!