Heard a rumour that it's only worth taking the BK contract if you intend to dodge paying tax. Otherwise you are better off on a Permanent Contract.
There are different payscale at BK, depending on your position. Give them a call, sure they'll have the answers. My info may be out of date....or maybe not as you'll never get an increase once on BK contract. So that's an inflationary decrease every year.
Warning......the taxman will get you eventually..........
Either way once you are in check out repaweb.org for all FR employees permanent or contract.