Alex Chesterman, CEO of Zoopla and recent recipient of an OBE, is one of the names behind a legal challenge to Brexit.

London law firm Mishcon de Reya is putting together a team who could mount a legal challenge if the government launches the Article 50 process - which would see the UK officially leave the EU - without first securing an Act of Parliament.

The firm said it was acting on behalf of a number of an unnamed group of clients.

"If the correct constitutional process is not followed then the notice to withdraw from the EU would be unlawful and open to legal challenge," said Mr Chesterman.

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