blackcircles.com is always the most competitive in my experience.
Jaimz
KwikFit can actually beat all their prices on the lower range stuff. As said for decent tyres I would be just getting some F1s or similar, but my father really does drive like an old fart, so performance tyres are totally wasted on him. He used to drive my old GTE on occasion, and he never took it over 75.