The reality of anyone joining for the supposed perk of the BA MSL has to fully understood. Yes technically you will be on the Master Seniority List however you will join with a six year engagement freeze at LGW, do NOT expect to move quickly at the end of that freeze as LGW has been historically difficult for BA to crew, pilots have very often been held back at the end of their freeze because the company physically couldn’t fill the seats with replacements. This problem will be even worse now given how unattractive BA have made the new LGW. Six years could very easily turn into something more resembling ten; a very long time to spend on what is a deeply unsatisfactory level of pay and with fatigue inducing rosters just for a carrot that will be visible but always taken just out of reach.