I was at the ring last august on Nankang NS -2R's and these would get my vote.
I've used 888's at the ring (not on my clio, an alfa 145) but in clio size the RS-2R's are roughly half the price but the 888's are not twice the tyre.
In Hucknall there is a company called J A C who are good, had a system made there some years ago for a fiesta.
Theres another place in bullwell next to a caravan place but cant find it on google.
Then in Sutton in ashfield there is another one but they have about a 2 month waiting list for work.