Thanks for the suggestion, I used to use Guildford tyres as they were the best around (and it didn't hurt that on of my mates used to be the manager there
).
Since he left a couple of years ago the service and quality of the staff has gone down hill; they were the people that screwed up my tracking after fitting new tyres. My steering wheel was straight when it went in, it was 30 degrees out when I left. I had to take it back 4 times for them to be able to get the steering wheel straight again! Since then my front tyres have worn out on the inside edge in 4k miles, so I don't think that they had correctly set geometry.