Hi Vectors and congrats.
I used to fly for the orange lot out of LTN and then LGW. Now, bearing in mind this was in 2001, I would take home £1100-£1300. This was operating about 40-50 flights a month.
Now, say for example your nominal sector pay was £13. Every domestic sector and AMS (maybe CDG too?) was considered as 0.8 of a sector, thus worth £10.40. All European sectors up to an AGP were worth 1.2 sectors, thus worth £15.60. Finally, the longer European flights like ATH were about 1.5 sectors, thus worth about £19.50 per sector.
Theses obviously are not the up to date figures, but I hope that you get an idea of how the system works.
They are good bunch of crew at LTN, happy flying!