The Supreme Court is to give its judgment in the legal battle over Brexit on Tuesday 24 January.
The highest court in the land will decide whether to reject or allow a Government appeal against a High Court ruling which blocked the royal prerogative being used to trigger Britain’s exit from the European Union without Parliament having a say.
The ruling was won by campaigners led by investment manager Gina Miller and hairdresser Deir Dos Santos,
In a case of major constitutional importance, three High Court judges unanimously decided last November that Prime Minister Theresa May did not have authority to use Crown “prerogative powers” to invoke Article 50 of the Lisbon Treaty to start the two-year process of negotiating the UK’s departure from the EU.
The Government is asking a record 11 Supreme Court justices to overturn the decision and rule the use of prerogative powers did not interfere with the sovereignty of Parliament.
The decision will be handed down at 9.30am.