Scapa
2500 / 52weeks = 48hours per week. If your definition of duty hour is correct, that would mean a 10am report on Saturday to be back at base again at 10am on Monday, and have the rest of the week off thanks very much.
Something tells me BA are hoping for a little better efficiency than that.
£2.40 from swipe in to clear I agree with, as that is the way that Gatwick currently do it. My point though is that these hours are not duty hours, and so will be a lot more than 2500 per year.