And obviously, Partygate; although I am entertaining the possible-but-unlikely idea that it was a deliberate ploy to make the public so angry, that they would never want a lockdown again. The government knew that they were toast by then, and with their reckless spending, they would have thought nothing of bribing Boris with a few million to be a sacrificial lamb, and to take all the blame for it. The timing of Partygate seemed very convenient, somehow: one revelation after another, drip drip. I anticipated that some MPs would get caught out and unseated by spending Christmas 2020 with their extended families; I didn't expect something as blatant as the Downing Street parties.
It was convenient timing @scalt, but that's more likely to have been because it was known about and sat on until such a time as it became useful. Starmer appears to have known something was going on pretty early in the day. He had Johnson squirming over misleading Parliament in April 2021, for example.
https://x.com/Politics_co_uk/status/1387364614116052992
'I'll leave it there... for now'. That hits differently in retrospect! And Starmer has said more about this since, too.
news.sky.com/story/keir-starmer-reveals-how-he-set-trap-for-boris-johnson-over-partygate-scandal-13157083
Also the high handed, stupid defence of Dom Cummings and his castle trip in May 2020 will have given a good indication of how poorly the Tories were going to deal with any such revelations.
But I do not for one second believe this was a deliberate ploy or an attempt to make Boris a sacrificial lamb. Because he took so many of them down with him. If that was the aim, there'd have been no reason at all for most of the rest of the government to spend months gaslighting and putting up with him. He was a dead man walking for months before they finally disposed of him.