You can call it populism if you wish. You merely use it as a stick to beat brexiteers with by constructing a case they voted leave for all the wrong reasons.
The sad reality today is that the political system in the UK is broken. The MPs of both parties are split between brexiteers and remainers and the tories have constructed a slow train wreck of our departure.
Even clot corbyn cannot make up his mind, otherwise why has he not called for a no confidencein the government?

This situation makes the outcome of the confidence vote for May a very precarious creature. Backbenchers largely voted for her to be ditched and whips have less control on the back benches. This struggle is by no means resolved, especially after her humiliation yesterday.
We are now in stormy seas in uncharted waters, while both parties rearrange deckchairs on the ship of state Titanic.

Hell is empty and all the devils are here.
William Shakespeare