@effingterrified
"Why was he driving around if he couldn't see properly? Given that's illegal and incredibly dangerous?"
He said his eyes had felt weird when he was ill. When he wanted to return to London after the 14 day isolation had passed, he was no longer ill. He said his wife suggested he checked that he was okay to drive that distance after being ill. It sounds to me as if she may be an anxious person (especially as she can apparently drive but didn't). I think I could envisage a situation where I might say that my DH ought to check he is okay to drive by doing a test drive locally after a serious illness, rather than embark on a long journey and discover he isn't up to it.
"Why did he go back to work at Downing Street AFTER going home to look after his sick wife, when the rules said he needed to isolate then for 14 days?"
The rules referred to Covid symptoms of a fever or a new continuous cough. He said she'd felt ill and had vomited and phoned him to come home. He stated she did not have a fever or cough. There was no reason to consider she had Covid. He then said that later "she felt better" so he returned to work.
"Why did he not ask his healthy niece to come down to him if he needed childcare, rather than risking everyone's health, including his own child's, by shoving him in a car with potentially infectious people for hours?"
He did not need childcare at this point but, in any event, his niece is 17 isn't she? Does she drive? Would she be able to drive a long distance to London? Was a person allowed to drive 250+ miles to provide childcare for someone else?
On the evening of 27th March, when he travelled to his father's estate, Boris Johnson told him he'd tested positive for Coronavirus. That probably changed quite a lot about his thoughts. He then considered he was likely to develop symptoms and, with his wife having not felt well with what he thought was an unconnected illness, he considered they may both become incapacitated by illness and unable to care for their son. As it was, they did not require childcare because his wife got better whilst he got worse. His wife was able to care for the son.
"Why did he drive to a busy, popular beauty spot, driving through the town to get there, whilst trying out his driving skills with dodgy eyes? How selfish and dangerous is that?"
His eyes were fine. A doctor said he was fit to return to work. He didn't drive to a beauty spot, per se. He test drove to satisfy his wife's request that he was able to drive safely. They stopped because his son needed a wee. The river actually runs for quite a long way so it just happens to be an area of beauty.
"Why did his wife lie and claim the son was well and they stayed in London the whole time?"
Did she do this? Can you provide a link with where she did this?