The UK Parliament met on Saturday for the fourth time in the past century, on 19th October, to vote on the revised Withdrawal Agreement negotiated by the Prime Minister and his EU counterparts. The date mattered, because under the Benn Act the Prime Minister would have to seek an extension to the 31st October Brexit deadline unless Parliament had approved the deal by 19th October. In the event, the vote as such never happened. Instead, Parliament approved an amendment brought by one of the senior Conservatives expelled from the Parliamentary Party for supporting the Benn Act, Sir Oliver Letwin. The Letwin amendment was purportedly designed to prevent the risk of a “no deal” Brexit coming about between approval of the deal and 31st October – some major legislation has to get through Parliament before Brexit can legally happen, and if that legislation had failed to go through between 19th and 31st October, there would be a risk of an accidental “no deal” Brexit. By approving the Letwin amendment, Parliament postponed its approval of the deal until the legislation has passed, thus also triggering the requirement in the Benn Act for the Prime Minister to seek an extension to the Brexit deadline.