The PCS union claims some court proceeding are being delayed today by strike action.
Nottingham Magistrates Court - Down to 2 courts from 11. Delaying sentencing in high profile case v. 19 climate change protesters. #pcsm20
Pickets are also on duty outside Government offices and other departments, including the Office for National Statistics in London where the latest unemployment figures have been published.
PCS members handed out leaflets which say the dispute is the most serious ever faced by the union.
More top news
Two SNP members have been suspended from the party after they were part of a group of protesters who disrupted a Scottish Labour rally.
A churchgoer broke down in tears as she admitted to murdering her terminally-ill friend by smothering him to death in his care home.
Radio 2 DJ vents his fury on Twitter after turning up for a flight home and finding it full - even though he had a ticket.