A great game for 75p.
Obviously pre-owned, but I've found out today that You can also Activate the game on STEAM, where it's not actually available otherwise. Just fire in your CD Key in the Activate A Product bit.
Please Note : Theres a chance the CD Key might already have been used on STEAM, but it's not really advertised as being a part of the package so chances are it wont have been. Even then, for 75p you can still install the game off the disc.
Also note that CEX Online has a Minimum order of £2.