There's a rather good article in the Financial Times from a former Tory government minister, entitled "Britain needs a new era of serious leaders". A sample:
Boris Johnson is a terrible prime minister and a worse human being. But he is not a monster newly sprung from a rent between this world and the next. Twenty years have passed since the Conservative party first selected him as a candidate. Michael Howard and David Cameron made him a shadow minister, and Theresa May gave him the Foreign Office. Thirty years of celebrity made him famous for his mendacity, indifference to detail, poor administration, and inveterate betrayal of every personal commitment. Yet, knowing this, the majority of Conservative MPs, and party members, still voted for him to be prime minister. He is not, therefore, an aberration, but a product of a system that will continue to produce terrible politicians long after he is gone.