The Criminal Bar Association has insisted today's action will not jeopardise trials, but warned that future trials could be at risk if the issue was not resolved.
It has been careful to call the walk out a "non-attendance" rather than a strike.
There will also be protests outside courts in London, Manchester, Liverpool, Leeds, Birmingham, Newcastle, Winchester, Bristol and Cardiff.
The Bar Standards Board has warned that any barristers who stay away from court will almost certainly be in breach of their professional code of conduct with "very serious consequences".
More top news
One medical worker told ITV News it was like 'entering your worst nightmare' as they tried to help look after the injured.
The Alan Partridge actor has made a video urging voters to back the party claiming the Tories will 'dismantle' the NHS if they win power.
Blur have proven their Universal appeal by storming straight to the top of the charts with their new album The Magic Whip.