Sorry to hear that you would make a decision about employment based on the responses above only. In any large organisation you will get wildly differing views depending who you talk to. The people who get on this site seem to have negative comments about every airline in the UK. They will complain about their airline while saying that the ones they don't work for or used to work for are fantastic. Talk to more people before you decide.
BA are not going to close down Gatwick. It is adding more scheduled flights this summer - Italy, Budapest, Prague and doing a lot less bucket and spade charters.