Question Author
Many thanks, Kempie (you again!) and Xanthippe for your prompt and precise answer. It seems that some people are just unobservant when passing the Old Bailey.
The reason for the blindfold, where it exists, is unconvincing. What good is a justice sytem which is blind, that can't see the visual evidence or the expressions on the faces of witnesses? I can quite understand why judges refuse to allow blind people to serve on juries.
If I am ever on trial, or giving evidence, I hope that everyone in the court will be able to see quite clearly what an upstanding, honest, truthful citizen I am...
Thanks again.