Its a hard call, but BA does not operate regional basing so therefore regional positions are redundant in the big picture. HOWEVER BA needs pilots so should offer these pilots to relocate to LHR to retain their jobs, if they do not wish to relocate then fine redundancy it is. Seniority plays very little part here in the eyes of the law. If BA were not to offer relocation and then to employ other outside pilots within 6 months of redundancy notices, then I think they will be on a sticky legal wicket.