Our legal system is pure theatre and always has been. Many barristers stand accused of being failed actors and vice versa. Judges love the dressing-up box and a chance to give their gavel a good bang. With murmuring galleries, shocking verdicts, swooning witnesses, cries of ‘all rise’ and ‘take him down’, the flummery and drama of the courtroom has always supplied a rich genre for film, theatre and telly.