It's the biggest day of industrial action in more than a decade - with half a million workers walking out.
Teachers join train drivers, civil servants, university lecturers, bus drivers and security guards from seven trade unions on strike today.
Dubbed Walkout Wednesday, the level of disruption caused is unprecedented in modern times.
There will also be rallies, organised by the unions, to protest the government's plans to try to enforce a minimum service while workers take to the picket line.
Teachers in England and Wales, who are members of the National Education Union (NEU), have embarked on their first day of strikes, which threaten to disrupt more than 23,000 schools.
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The NEU is estimating that around 85 per cent of schools in England and Wales will be fully or partially closed today (Wednesday).
Elsewhere, rail passengers face another day of travel disruption as train driver members of Aslef and the Rail, Maritime and Transport union will strike once more in a long-running dispute over pay, jobs and conditions.
It comes as fresh industrial action has been announced for later this month, with thousands of ambulance workers across five services in England set to take action on February 10 in a long-running dispute over pay and staffing.
Downing Street has conceded that today's mass strike action will be 'very difficult' for the public.
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