We just had six days in Cornwall, We stayed in a remote cliff top bungalow owned by a friend. We took 95% of our food & drink. The remainder we got from the local farm, and the village shop. So we didn't really interact with anyone. One refuel on the way down, back non stop. No toilet breaks.
Plenty of walking. The locals told us that July & August were insanely busy, everywhere was packed out. Even this week, people were sitting around cafes & pubs without masks and close together as if everything was normal. October is normally quiet in that location, but this year it was significantly busier.
Apparently holiday homes are in great demand as people reconcile to the awful truth that they may be holidaying in the UK for a while.