Teachers are on their way to Parliament Square to demonstrate against the government's education policy.
ITV News' Charlene White tweeted a video of the protesters as they made their way through Regent Street.
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Teachers are putting children's education at risk and disrupting parents by taking "unnecessary" strike action, Nicky Morgan has told Good Morning Britain.
The education secretary denied claims the government was cutting funding, saying the schools budget was the highest it has even been.
She said less than a quarter of members of the National Union of Teachers (NUT) had voted for strike action, which she claimed represented less than 10% of the total teaching profession.
Morgan also said the government would re-engage in talks with the NUT to "air all the issues".
"This strike is unnecessary, it is putting children's education at risk and inconveniencing parents."
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The chief inspector of schools has spoken of his experiences as a head teacher in London's inner-city schools saying he told people if he thought they were a "poor parents."
In an interview with The Times, Sir Michael Wilshaw said: "I was absolutely clear with parents; if they weren't doing a good job I would tell them so. It's up to head teachers to say quite clearly, 'You're a poor parent'.
"If parents didn't come into school, didn't come to parents' evening, didn't read with their children, didn't ensure they did their homework, I would tell them they were bad parents.
"I think head teachers should have the power to fine them."
"Bad parents" should be confronted by teachers while headteachers should be given powers to fine mothers and fathers who fail to support their children's education, the chief inspector of schools has said.
Sir Michael Wilshaw called for head teachers to be given the authority to impose financial penalties on parents who allow homework to be left undone, miss parents' evenings or fail to read with their children.
The head of the schools watchdog Ofsted also told The Times that poverty was too often used as an excuse for educational failure among white working-class families, whose children were often out-performed by those from immigrant communities.
The National Union of Teachers has voted for a series of fresh strikes, starting with a national walkout in June.
The action relates to a long-running dispute over pay, pensions and working conditions.
Teachers who are abused online by their own pupils "feel very personally hurt" by the vitriol directed at them on the internet, a headmaster of an east London school told Daybreak.
Ges Smith, the headmaster of a school in Walthamstow, said there were "two elements" to the effects of online abuse.
"One, it can be professionally and credibly damaging. And two, I have seen people who have been abused by young people online and they actually feel very personally hurt by it."