Instead of threatening Parliament with "her deal or else", she should instead demonstrate that the shape of a future relation with the EU is largely left open. First settle the score with the EU and cement the UK's reputation as a reliable negotiating partner before starting to design a new UK.

To those who complain about the enduring nature of the back stop, the solution to it is in their hands and which they already promote - technology which does not exist or cannot (yet) be trusted; a comprehensive (trade) agreement the like of which has never yet been negotiated.

In other words 'kick the can down the road and minimise the immediate disruption' until another English trait kicks in - 'that something will turn up' in the fashion of Dickens' Micawber.