Likewise Tower only ATCOs at Gatwick and Stansted?
If you looked at the scales you would see that SS is at the same grade as BB eg band 3. Now that is approximately £2500 more than band 1 and £1500 more than band 2. A recent postee into SS from LC had to take a pay cut to go there as they lost inner London weighting. Now Stansted is shifting upto 680-690 a day up about 30 or so a day on last year. I think the problem is the difference between the bands. Go from band 3 to a 4 and the scale max is £12000 different with 5 a further £8000 on. That is the problem not the fact that some get more than others.