Don't know a website mate but Cuz got my old phone unlocked when I sold him it, so give him a ring, can't remember the details but think he took it to a shop on Sheffield Road, might have cost him a tenner though so don't know if it's worth a tenner to you to get that one unlocked
All the online ones i know of you have to pay for by card before they will send you the code, Monstermob used to do nokias by phoning a premium rate number and entering some details on the keypad then they tell you the sequence of buttons to press, Best bet is unlock-a-fone on sheffield road mate HTH (Y)