Sir Ed Davey, who leads the Lib Dems, declared last week: ‘Squatter Sunak is holed up in Downing Street, desperately clinging on to power.’ It was odd of him to remind voters of the origin of this little joke about squatting. On 8 May 2010, two days after Labour’s defeat in the general election, the Sun ran a big headline: ‘Squatter holed up in No. 10.’