There must be a glut of these in the country at the moment.
If your car runs on a very modest 195/50 x 15" like my Golf does, then A539s are available for a frankly unbelievable £25.30 each on ebay just now.
I know a few people using this tyre on everything from a new Morgan Roadster (the 226bhp one) to a Locost Zetec and all sorts of boring stuff.
Anyway - got to be worth a try at that money, so I've just bought some.