On Tuesday we’re expecting that the judges of the highest court in the land will rule on whether Boris Johnson’s decision to shut down parliament ahead of next month’s Brexit deadline was legal or not. Scottish judges have already declared it unlawful

Just a few weeks ago very few of us could name the most recent Supreme Court case, but it’s suddenly the centre of attention. The live-stream of the first day of the hearing there last week was watched by more than 4 million viewers making this arguably the World Cup final of constitutional law. Today we’re asking more about the remit of the Supreme Court: why cases about access to toilets make the cut, who is in charge, and how Supreme Court justice Lady Hale came to be nicknamed the ‘Beyoncé of the judiciary’. The BBC’s Dominic Casciani and former barrister and legal journalist Afua Hirsch have been paying very close attention to recent proceedings, and came to the studio to answer our questions.

Presenter: Tina Daheley