BA DEP starts on around £33K + allowances.
Average takehome as a DEP on mainline shorthaul in first few years is £2400-£3000.
I know of one recent DEP on the 75/76 who has left to go to Virgin on the 744.
BA is no way the best payer, ie. Monarch starting pay for experienced pilots is around £40K + they give you 3 stripes !
Or GO or Easy jet and get a command within a year and be on £60K+ .....
BA is a VERY long term view !