Scooby
What part of the country are you in, the reason why i am asking is that down here in Hampshire there is a place called Micheldever Tyres, which is by far the cheapest i have ever come across. They have people come down as far as north wales just because they are the cheapest around. If you are going to visit them be prepared to queue for about 60 to 90 minutes at any time of the day, but it will be well worth it.
That's my 5pence worth.
Cheers
Antony