Boris Johnson has been warned he could trigger the “gravest” constitutional crisis since Charles I if he refused to resign after losing a vote of no confidence, as a prominent businesswoman threatened a judicial review.

Legal campaigner Gina Miller said on Sunday any attempt to suspend Britain’s parliament in order to push through a no-deal Brexit would be unlawful, announcing her intention to challenge such a move in court if necessary.

Any future attempt by a Boris Johnson-led Government to “bypass” Parliament to pursue a no-deal Brexit “would be beyond a prime minister’s powers”, campaigner Gina Miller has said.

Activist is reassembling team of top barristers to stop parliament being shut down to push through Brexit against wishes of MPs.

The remain vote may split, but we can still make our votes count and halt the Brexit party in its tracks.

Time is running out, but it is not too late. It is only right, morally and democratically, that the people of the UK are given a vote on a future we will have to face together.