Not sure about the UK, but in Australia, if I suspected my eyesight was bad, and went for a drive, and was involved in an accident, I would probably be charged with negligent driving. Even if I weren't involved in an accident, the negligent driving would still be breaking the law, but there would be no occasion to prove it.
He cited doubts about eyesight as an excuse for a 30 minute leisure drive. Apparently, one retired police chief suggests that's illegal. Which does sound about right.
He didn’t technically break a law, but definitely broke very clear government guidance – “Stay Home“ is about as unambiguous as it gets. Millions of people took the rules very seriously, missing loved one’s funerals for example, and he drove 260 miles to his parent’s house and a local castle.
The guidance from Government needs to read in conjunction with the law because the guidance describes "reasonable". The guidance was clear: do not leave home; do not travel to second homes; don't mix households; if you need help use your local networks.
You've been allowed to leave your home from Day 1 of the lockdown and there is no law to say otherwise
Edit: Though under reasonable terms, including exercise and food shopping. If you have only obeying the slogans, which was my point, well that's unfortunate
> 6.—(1) During the emergency period, no person may leave the place where they are living without reasonable excuse.
He claims his reasonable excuse was to get childcare from his family in Durham. That might cover his trip from London to Durham, but it doesn't cover his trip back again.
I'd argue it doesn't cover his trip from London to Durham because he had childcare available in London which he chose not to use.