If you trade in 25 quids worth of games in to amazon they will give you £10 bonus towards their 5 big titles, which includes GTA, making it £34.
Otherwise its £39 at tesco using the code listed a few posts above.
I did that without knowing of the offer, got myself Lords Of The Fallen with my trade in money.
Then I got the email with the £10 off voucher and felt compelled to use it.
Got COD coming on Monday