They don't stock them on ocuk but just do a quick Google for;
Abit Airpace WiFi PCI-E card
Average price seems to be about £9 / £10.
Can't see anything glaringly wrong with them, mind I haven't had my coffee yet
This.
Brilliant cards for the money, much better than other belkin/netgear cards I've had which cost twice the price.
I've actually got these in my PC, the GF's PC and the parents' PC.