Well GeorgEGNT the alternative is:
A - forgot about pursuing a career in aviation
B - pay for line training etc yourself
C - apply for a cadet scheme with a lower salary elsewhere.
I can't believe you'd actually be concerned about the salary (which is well above a living wage) given the state of the industry.
It's only for a few years and it's not that expensive to live outside of London.
Also employees who work within airports i.e. shops etc seem to get by just fine on much much lower wages - I know it's not the best comparison.