you are lucky you are in the uk ... 20 years ago my brother and i
did a road trip ... maybe 2 hours
away from home, we stopped at a rest area.

there was a guy in his car next to us (resting?) ...
a state policeman pounded his door, shone his maglight in his window and
shouted " hey this is a rest area, no resting allowed " ...

if you end up taking a wrong turn and instead of
south england end up in CT/USA, get those glasses with open eyes on them
they might help in situations like this