It all depends on the flying you do, and whether you bid for trips but I think that the average for Eurofleet LGW as approximately £1100 a month and Eurofleet LHR is approximately £1300.
That would be for a new entrant main crew member. The only thing with BA is that you can not apply for Purser until you have been with the company for at least 2 years. So if quick promotion is what you are after, then BA is nt the one.
All the above salaries are based on the average roster of a few there and backs and at least 2 or 3 trips a month.
I personally bid for 3 to 4 day trips and no there and backs, and next month I have 1 x 4 day trip, a 3 day trip and 2 x 2 day trips and 1 there and back. And the trips are where the money is.
Oh, also have 9 days leave as well...so as you can see it is still a busy roster.