ATS on Histon Road is very good; there are two other tyre places a bit further down the road (i.e. out of town) as well, just in case ATS are out of stock of requisite tyre.

Buy a wheel nut wrench with telescopic handle to keep in the boot for next time. Tyre places tighten the nuts with a pneumatic device, making them almost impossible to loosen with the silly little gadget in the toolkit that comes with the car.

I also keep a pair of old leather gloves in the car, and an old rubber mat to crouch on when changing wheels.

In fact it was too late; I'd gone to Kwik-Fit already. But they didn't go anywhere near my wheel nuts: the defunct tyre was on the wheel I'd taken off, so I just rolled that wheel into the shop and gotthem to put another tyre on it. I'll change it over myself when I need it.

The gloves and mat are a good idea. My knees were definitely complaining after last night...