Over a million public sector workers are taking industrial action against the Government in a series of rows over pay, pensions, jobs, conditions and spending cuts, according to union leaders - a figure disputed by the Government.
A union has described the Cabinet Office's figures on the amount of people striking today as "laughable".
The Cabinet Office claims a fifth of civil servants - around 90,000 people - are on strike compared with a third in the last big walkout in 2011.
However, the Public and Commercial Services union dismissed the Cabinet Office's claims, saying: "No-one can trust this government to keep reliable figures, it can't even tell us what it's done with dozens of Home Office files."
Union leaders said they were "overwhelmed" by support after a strike by public sector workers caused widespread disruption.
David Cameron, Michael Gove and other Government figures depicted in a variety of unflattering manners by striking public sector workers.
Hundreds of schools are to close tomorrow as teachers join strike action. Find out what schools in your area are affected.