I shop at my nearest local supermarket but just once in a while I pop over to Sainsbury's at Heyford Hill to check that my supermarket is cheaper — which it always is — than any of the others. I really go though to take advantage of having my car washed by the guys in the car park who do a really good job while I'm inside the shop.

My car is very well cleaned, even the strip on top down the middle of the car, where I'm not tall enough to reach it myself.

And the guys with their smart trolleys who do the cleaning are friendly and courteous.

I've wondered why other supermarkets don't promote such a valuable service.

Sally Lessiter Holton