He doesn't think the rules need to apply to him because he is of superior intellect to the masses. He would have known that the 'testing his eyesight' excuse for traveling to Barnard Castle sounds stupidly far fetched. The only way he can be ousted is to resign or be pushed based on the civil service code of conduct. He's blatantly showing us that it doesn't matter how he behaves as he has Boris is backing him up and insisting that we just 'move on'.
AIBU in thinking this is just his way of proving that he is untouchable and he's probably enjoying it? It feels like a sort of old boys bet 😕