There were warnings from the start , Johnson was not popular in Scotland even before he became prime minister, and when he became prime minister he made it immediately clear he'd never sanction another independence referendum.
He came to power on the back of Theresa may's failure to get a deal on brexit and won a landslide majority in 2019 on the back of a simple slogan - get Brexit done. He was at his best campaigning in simple straightforward lines particularly on brexit he was big on headlines but lacked the substance and attention to detail to be the great prime minister he desperately wanted to be.
An early signal was the illegal propagation of parliament where he was found to have lied to the queen. Then he made brexit happen which was what many had voted for, then covert struck. He was criticized for being slow to lock down struggled to cope
The virus cost thousands of lives, and almost cost the prime minister his, but vaccines saved thousands more lives and saved thousands of jobs. Boris had created a blokey persona with voters with his twizzled hair and crumpled clothes and tv appearances.
It looked bad for boris johnson but russia's invasion of ukraine bought him some time, then he received a fixed penalty notice for his birthday party in downing street when he was famously ambushed with cake, revelation after revelation followed about partygate.
The sugray report into the downing street lockdown parties showed failures of leadership and judgment. Boris johnson won a confidence vote among his own, less convincingly than he'd hoped but quickly lost two by-elections making it clear public confidence had already gone. Voters and conservative MPs knew what they were getting when they backed Boris johnson's prime minister a man who had been sacked from previous jobs for lying but had carried the celebrity of being known by his first name, Boris was a star like trump in America, he broke out of the political mainstream but eventually the shine was worn away by the scandals