77.....The cabin crew who were based at MAN/GLA/BFST were ALL mainline NSP crew and they were part of the seniority list they kept their seniority and rank when coming to LHR .Also many of them had been CSD's and PSR's on longhaul before going to the bases.You must be thinking of the BAR base at MAN .The shuttle cabin crew were all mainline and in the NSP.I have seen many of them in CRC and they are still CSD's and PSR's.
I would like to add that the MAN/GLA girls were so switched on you never had to concern yourself about anything .Very reliable and efficient.