I got the wheel from a member off here for a tenner. It needed rubbing down and painting black, but was in great condition. The centre was from eBay at around £20. (although I think is from a mk1) so all in all it cost me about 40 quid to get it as it is now, bargain!
Up till then I hadn't seen any mk2 wheels on eBay, only ones for mk1's or a capri. Since then quite a few have popped up for sale though! They seem to go for £30-50 depending on condition.
Thanks for the comments, you're right I'm going to go with the black carpet, although recently I've been thinking of stripping it all-out and going down the cage/buckets/harnesses route.
Hmmm decisions decisions.