You'll be lucky to take home £2800 a month. I barely take home an extra £300 a month. but thats due to Cr*p rostering (still).
It also depends on your base. Those at EMA and BHX take home the most, MME and MAN the least. Sector pay is not like easy where it is factored (depending on length), so you will earn more at BHX and EMA for a 4 sector quick and easy day than putting in more time on a 2 sector at MAN or MME.
But the futher you are based from "tiny Town" the more enjoyable the flying.