hi sean,
try www.instant-radio-code.co.uk/
you have all the details and providing you have a valiid email address,
cost about 7 quid,cheaper than the options already suggested,
the guys can only help on here if they already have the code relating your radio on file.
most are a guess hence no further response from the questioner,
I know that if I got a correct code for nothing I would at least respond back.
try the site I suggested,
hope this info is helpful,and good luck.
paul, March 2012