At the time of writing Baroness Ros Altmann, the former UK pensions minister, is still a member of the ruling Conservative Party.

We meet in Westminster just days before seven MPs, including Chuka Umunna, resign from the Labour party to set up the Independent Group in protest of their leader Jeremy Corbyn’s approach to Brexit and anti-Semitism. Two days later three Tory MPs join them, quitting over what they say is Prime Minister Theresa May’s “disastrous handling” of the UK’s imminent departure from the European Union.