AMS, it's between approx £1500-1600 average take home on a full-time contract, and for a full month's work with no leave.
No one takes home £1200, that's way too low unless you've been off on leave, sick or training.
£1900 is high but possible on the occasional month dependent on what trips you get. You won't get that figure very often unless the only place you visit is Zurich/Geneva/Basel (admittedly that's all some crew seem to bid for).
Warning: your first 3 month's pay will be very low due to training, assigned rosters (unless a friend helps you to bid) and allowances paid in arrears.