Brexit: Gina Miller says she has a strong case in court

A legal case at the High Court will clarify the constitutional process necessary for Britain's exit from the European Union.

The challenge is being brought by investment manager Gina Miller, who among others, is seeking a judicial review of the government's intention to invoke Article 50 of the Lisbon Treaty without seeking approval from Parliament.

Ms Miller told the Today programme that "the government cannot use this ancient secretive royal prerogative" to conduct the negotiations.