drunk_scotsman,
The financial benefit is the tax relief - see above. The figures on TC's website haven't been updated - the current (basic) starting salary is around £23k (which goes up year-on-year). So, p/a, you can expect £23k (basic salary) plus £12k (tax-free) plus duty pay, allowances, etc. Again, assuming the deal is similar to last year's.
Non-financial benefits are a conditional job offer and a paid-for type rating.
V1R
