European Union (Withdrawal) Bill

Timing is the crucial issue. Given that there are many examples of an accelerated process being used to get primary legislation through this place on many different matters, including in a single day when that has been necessary, why would it not be possible, if time was starting to run out, to have a very simple one or two-clause Bill that would do the bits of things on which the Minister needs to get agreement and to put the secondary powers in place, and therefore at least have a vote on primary legislation? Why is it not possible to do that very quickly to deal with the concerns that have been expressed?