Is there a doctor in the House? Sarah Wollaston, with her new leader Jo Swinson, said she backed Lib Dem policies on health and social care

Sarah Wollaston has joined the Liberal Democrats as Jo Swinson, the party’s leader, dismisses Jeremy Corbyn’s attempt to take charge of efforts to stop a no-deal Brexit.

Dr Wollaston, 57, who was elected as a Tory MP in 2010, takes the Lib Dems’ tally to 14 after its victory at the Brecon & Radnorshire by-election this month and the arrival of Chuka Umunna, the former Labour MP, in June.

Mr Corbyn has told MPs, including the Lib Dems, that they must install him in No 10 as a caretaker prime minister if they want to thwart Boris Johnson’s Brexit plans. Under the Labour leader’s proposal, MPs would oust Mr Johnson in a confidence vote and make him prime minister temporarily to ask