Having been on the Flexicrew contract since its inception, I have to disagree with the above figures. The minimum take home I have had is £2350 and that was with a weeks sick. I found the majority of months the take home to be between 3-4k, in fact my highest take home was £4800. I would work 80-90hrs per month most months with 3-4 standby's. Then have a few months with 50-60 hours usually with around 9-10 standby's.
Yes 900 x 43 =38700, but add to that 4-5 standby's a month (7-9k pa) and 28 days leave at approx £230/day, plus sim and sep payments. Student loan and training loan repayments are irrelevant as they would be repayable in any case. The money isn't that bad in a general case, it is the atrocious rostering, lack of security or protection that make you question whether it is all worthwhile.