The big flaw is that you are declaring it an offense.
It wasn't.
But another flaw is your claim that he went to Barnard Castle to test his eyesight. It was his wife who was concerned. He was prepared to go straight to London.
From his statement.
On Sunday 12 April, 15 days after I had first displayed symptoms, I decided to return to work. My wife was very worried, particularly given my eyesight seemed to have been affected by the disease. She didn't want to risk a nearly 300-mile drive with our child, given how ill I had been.