Duck,
With all due respect if you earn 50k you should actually leave afforadable* housing for the people who actually can't afford to buy a house in the mainstream market!
Surely the fact that the council allows you to earn up to 60k and still qualify proves that someone earning that "actually can't afford to buy a house in the mainstream market!"........
Anyway, in some of the developments, even with the discounted rate, you couldn't actually afford the mortgage unless you were earning at the higher end of the thresholds?!