War Hero
Since no one else has responded i'll take a wild guess, though it has been a while since i got my third year.

I am of the opinion that you get approx £400.00 for your 1st, between £700 and £800 for your second, approx £1,100 for your third and up to about £1,500 in your last.

I am standing by to be corrected as there will be someone keeping an eye on this thread just waiting to correct a poor helpful soul like me.

Sorry i cant be more exact.