Also there's import duty at 20% to factor in.
Also, if you buy two rims/wheels then make sure you ask them to ship them as one package. I didn't bother, and they shipped them as two separate packages each declared as the value of both rims, so I got double the import duty. They were very good about refunding the difference (refunded within 2 hours of me requesting they did so), but it would have been easier if it was sent as one.
I think £80 per rim is probably an accurate estimate.