Those pictures do indeed exist of the PM with a glass in his hand. The police looked into that and determined that it was a work event at that point - a farewell speech by the boss, which is a normal feature of working life.
I take your point about the party culture, although from what I picked up, he was unaware of these events, which appear to have been organised by the civil servants. He has acknowledged that there was a leadership vacuum there due to the fact that the PM cannot be expected to know what the staff are getting up to as he is too busy with the job of running the country. He has therefore reorganised how No 10 operates, to take account of this problem
As far as Starmer is concerned, he’s the one who is responsible for making this into a big deal, which it really isn’t.
Beergate is actually indicative of a worse breach of the regulations than Boris’s misadventure. The PM inadvertently broke the rules, having genuinely believed that as the cake presentation was a very quick event between meetings involving only the people he and others were freely mixing with anyway at the office, he was not committing an offence. Whereas Sir Kier was attending a beer and curry party AFTER work, which he should have known was wrong.
However, even if Sir Kier is issued with a fine, it is still my view that neither man should be forced to resign for such trivial misdemeanours. If Sir Kier wants to be hoist by his own petard, however, that’s entirely up to him.
Johnson has ignored the rules all his life.
This wasn’t a one off ,there were multiple parties .
Johnson was supposedly neither death with Covid yet he allows everyone to mix , just typical of the type of character he is