Brexitwatch: the bent referendum. A letter to the Prime Minister

Most MPs know Brexit will damage the UK. They have been proceeding with it only because of the referendum result. 

But we now know the referendum was won illegally by the Leave side, who broke spending rules. So why isn't Brexit being stopped? That is the question I have asked the Prime Minister:

'In view of the revelation that the Leave campaign won the Brexit referendum illegally, I am surprised you have not already been in touch with the EU to withdraw Article 50.

When do you plan to take this action?'