Campaigner Gina Miller speaks outside the Supreme Court, after Britain’s most senior judges ruled Theresa May cannot trigger the Brexit process without consulting parliament

Campaigner Gina Miller speaking outside the Supreme Court in London, on Tuesday.

Britain’s most senior judges ruled, in Miller’s favour, that prime minister Theresa May cannot trigger the formal process for the UK’s exit from the European Union without consulting parliament, reinforcing the judgement made by the High Court last November.