Some folk might want to consider this deal (hukd link) instead.
Buy the game for a net price of £4.99 after trading in two games - and several of those games are available for less than a tenner, and occasionally for less than a fiver, meaning you could get GTA:V for less than fifteen quid...

Bear in mind you actually pay £39.99 and you'll receive the game plus an envelope to put your old games in - and then you get £35.00 back when they receive the old games. Payment is authorised straight away but not taken until dispatch. I personally have no idea how reliable/fast/solvent the company (gamestop) is.

Looks good to me. The list of games you can trade in numbers two hundred, and they've promised not to change it. I'm currently weighing up "great deal" against "niggling doubts"...