Just to clarify behind_the_second_midland's post there are no BA mainline Flight crew based at EDI or GLA however there are still Cabin crew who still live and work there. They operate shuttle flights to LHR just like the the cabin crew at MAN. The similar BFS base was closed a few years ago.
To be clear - BA mainline flight crew are only based at LHR and GLA. All other flight crews whereever they fly to or from are either franchise (GB, Bmed, etc) or wholly owned subsidiaries. (BAcitiexpress)