I'd be very interested to see what happens to LGW in particular IF the Davies commission recommends a 4 rwy hub (either at an expanded LHR or newly built somewhere else)
It would be logical for BA to consolidate all their southern operation at that one location (wherever it is), pulling out of LGW completely. Not sure how that would leave LGW, seeing as EZY are concentrated mostly at LTN and RYR at STN. Is there enough periphary traffic to sustain LGW to the level it would need/want?
As for BA at MAN, it would seem to make some sense for them to base some a/c there post-LGW. Would depend on how the numbers stack up, which of course they didn't when BA were there 20 years ago, but wouldn't be at all surprised to see it especially given the massive investment that is going into MAN