[jfk13]

Running power -- even just 13A power -- to every parking bay, not to mention ensuring those "simple domestic sockets" are safe to use in all weather conditions, will probably make this quite a bit more expensive than you think.

[kwhitefoot]

Outdoors rated 13A sockets are readily available in every electrical supply shop along with the necessary RCDs. We have similar things here in Norway and have done for at least forty years and we get much worse weather than the UK. I mean they can be buried in the snow, never seems to be a problem.

In case you wonder why we had them they were for car engine preheaters. Handy when it is -20C and snowing.