I really don't see a problem in requiring people to either wear a mask or have a letter from a health professional exempting them. It doesn't need to even state why. I really think people not wearing a mask who can is on a par with drunk driving. It puts lives at risk.
As for travelling to visit places, I've seen comments like 'if you get done, it's less than a parking fine' - so I'd up the fine to much higher levels. Family of 5 visiting Snowdon, that'll be £5,000! Have a nice day
Remember in France you couldn't leave the house without a letter stating where you were going and for what reason. I think they're imposing a curfew now as well. None of us like having our freedom limited, it's like house arrest for us but when your freedom means possibly killing other people you have to accept it.
We drove down to the postbox in the village today and were very naughty, we looped back the long way instead of a U turn. That was the excitement of the day...