Leading parties on both sides of the Government's Brexit appeal case have arrived at the Supreme Court in London for the first day's hearing.
The Government is appealing against a High Court ruling that the Prime Minister must seek MPs' approval to trigger the process of taking Britain out of the European Union.
Gripping TV it may not have been but the televised four-day hearing was a box office event for fans of legal argument.
The UK's highest court has been told that a motion in Parliament does not have any bearing on the legal issue it is having to decide.
The Supreme Court is hearing an appeal to overturn a High Court ruling that said the prime minister could not trigger Article 50.