Just Tyres mate. They'll do it for cash usually; use them all the time.
I've done that before, and the prices on mytyres were half what the tyre fitters actually wanted, and then they couldn't fit me in for 3 weeks.Go on mytyres.co.uk - there's a list of fitters local to you and prices they charge. Cheapest one from memory is in Dogmersfield near Hook and it's about £10/tyre.