FO Year 1 is 70k
FO Year 13 is 90k
(15k of that is flying pay and the balance is basic pay)
It goes up roughly £1400 a year
Plus around £9000 in allowances for down-route sustenance per year
Plus 15% of Basic Pay paid by the company to pension fund if you pay the minimum contribution of 6%
So year 1 FO should gross around £85k for 750 hours. Could make a bit more by voluntarily helping out on days off or doing some extra trips.