I'm a DEP PP3 75/76 and last month , which was a busy month, I took home just over £3,450. For that I flew 71 block hours and was about 1 1/2 hours over CAP. Flew no long haul last month and had 14 days off. Leave at BA is around 6 weeks so if you take your leave in 1 week blocks you can end up with a week off every other month. This would reduce take home to about £3100-£3200.
Hope this helps.