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The date the UK was meant to leave the Brussels bloc was March 29 but an extension has been granted until April 12. However, English Democrats leader Robin Tilbrook claims the new exit date should have been passed by the House of Commons and the House of Lords before it was approved. Mr Tilbrook has launched a High Court battle claiming the UK has already left the EU and in the judicial review application, the English Democrats claim that Mrs May did not have the power to extend the exit date past March 29.

If the argument is correct, then it would mean that, under UK law, we left the EU last Friday at 11pm

This comes as the former appeal judge Sir Richard Aikens has said the way in which the Article 50 extension was organised is “highly unsatisfactory” and “arguably illegal”.

He told the Daily Mail: “If the argument is correct, then it would mean that, under UK law, we left the EU last Friday at 11pm.

“The Treaties would no longer be binding and the UK would no longer be subject to EU law.

“The argument obviously becomes much more important if there is any attempt at a longer "extension", but, logically, if the argument is correct, then any attempt at a further extension would be a legal nonsense as the UK would already be "out”.”