4.42pm GMT

Here's a final summary of the day's events:

• Thousands of schools across England and Wales were closed or affected by the strike called by the National Union of Teachers over pay, pensions and working conditions, with schools in several major urban centres – including London, Cardiff, Manchester and Birmingham – most heavily impacted by the industrial action.

• The Department for Education estimated that just 12% of schools in England were closed by the strike action, which would amount to nearly 3,000 schools in England, and hundreds more in Wales. No figures were available for the number of schools partially affected.

• The DfE said: "This is by far the lowest level of support for any national teachers’ strike since 2010. Parents will struggle to understand why the NUT is striking over the Government's measures to let heads pay good teachers more."

• The NUT claimed the strike was a success, with a protest march estimated by police at 10,000 taking part in central London. Similar demonstrations took place in Liverpool, Birmingham and other cities.

• NUT president Christine Blower warned that further action could follow later this year if negotiations with the government didn't make progress. "Teachers love teaching but are crushed by the long hours and stifling accountability regime. If there isn't movement in the talks there could well be further strike action this summer."

• Schools minister David Laws said that the strike was "totally unnecessary and wrong," telling Sky News: "I think it is very sad that the National Union of Teachers have decided to take this industrial action. I don't believe that it is supported by the overwhelming majority of teachers."

• A leaked email from Chris Keates, general secretary of the other major teaching union, NASUWT, is alleged to have complained of "abusive social media campaigns being run by NUT and the aggressive accusations made against us nationally". The NUT denied the accusations, while NASUWT made no comment on the email.

