I think the Tim Matthews issue is serious not just a silly lie and I don't know why people aren't more annoyed about it
It is annoying - because it gave Johnson some room to say that the reporting was false - even though the key elements of the story were correct.
The initial response to the 2 sightings (of which one was confirmed to be true) was:
"They added: "Today they are writing more inaccurate stories including claims that Mr Cummings returned to Durham after returning to work in Downing Street on 14 April. We will not waste our time answering a stream of false allegations about Mr Cummings from campaigning newspapers"
So there was a true allegation that he had gone to Barnard Castle -and a false one that he returned.
That was the wrong response - if they had said that he had gone to Barnard Castle but refuted the 2nd one, that could have taken the sting out of the tail.
But they didn't