As in a jetwash? Most Sainsbury's garages have them. Maybe google for ones near you and give them a ring to check.
I wouldn't advise putting your car through a traditional carwash. As much as they should be safe for the car and well designed these days, their reliability still depends on whether they're maintained properly. The majority probably aren't. I've seen a few horror stories first hand.
Can't go wrong with a jetwash as long as you avoid the brush on a stick. This bit usually spews out foam, so you can hover it over the car to cover the car with foam then wash it with a wash mitt of your own. Might get a few funny looks, but it'll work.
