My view would be that true wildcamping would be in the middle of nowhere, completely self sufficient for power, water, food etc. for a few days, and completely undisturbed (If you can still find that in the UK).
In which case, although I have been known to do this, my preference is a pub car park, or at least a stroll from a pub, so strictly, what I do isn't really wildcamping. Doesn't bother me, I doubt I'll get drummed off the site for it.
Usually, the nearest I get to it is either in the boat or the canoe.