Anti-ice,
I don't think BB's that far off....He/She is talking minimum/maximum take home pay...although I will say I think we're talking LHR crew only.I'll take your word for s/haul,but the l/haul estimates are reasonable(max/min).
I'm L/haul crew LHR and without saying what grade or rank,I think BB has it about right...ie,min/max.Seen enough payslips in my time,here and there, to concur.