UK court says parliament must have Brexit say, dealing blow to government

The government said it would appeal against the decision and a spokeswoman for May said the prime minister would press ahead with the planned timetable of launching talks on the terms of Brexit by the end of March.

The pound rose on the court's ruling, hitting a three-week high against the dollar. Many investors took the view that lawmakers would temper the government's policies and make an economically disruptive "hard Brexit" less likely.

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In theory, parliament could block Brexit altogether. But few people expect that outcome, given that the British people voted by 52 to 48 percent to leave the EU in a referendum in June.