I don't think that it's any big secret. I'm sure that the figures are published somewhere.
The basic in the first year at the moment is £2379.49 a month. Tax is very good here and so most of the chaps take home about £1750.00 to £1850.00 a month depending on entrance to the co. pension scheme; claiming the uniform allowance & mortgage tax relief.
There is an incremental scheme but after 15 months I've not seen it