From USS NEVERDOCK:
"Men and women in white wigs and Muslim women in veils, Monty Python couldn't make this stuff up. I can just see Python have the defendent give their evidence through a letter box so the woman in the veil can see what it feels like. What next? Darth Vader as prosecutor?
John Cleese call your office.
"British justice has always been based on the principle of being completely open. How can it be open if a lawyer will not show her face?”
So, in other words, it is ok to come to court in a disguise and hide your true identity from law.