Boris Johnson has drawn up plans to “sabotage” any Brexit extension without breaking the law, the Telegraph has learnt.

It means Monday’s vote on a general election is the “last chance” for MPs to block a no-deal Brexit, the Government believes.

The Prime Minister’s key advisers held a meeting on Sunday to thrash out a strategy to scupper Parliament’s efforts to force a three-month Brexit extension if no new deal is agreed.

One plan under serious consideration would see the Prime Minister send an accompanying letter alongside the request to extend Article 50 setting out that the Government does not want any delay after Oct 31.

On Sunday night, a Cabinet source told The Telegraph: “There is a prescribed letter that has to be sent... Does that stop the Prime Minister sending other documents to the EU? I don’t think it does.

“A political explainer perhaps, as to where the Government’s policy is. It has to make clear that the Government is asking for an extension, but let’s not forget what the next step is.

“Once that is done, the Europeans are going to ask: ‘Why? What is the reason?’ [What] if the Government said: ‘We don’t have any reasons for an extension’?