Tens of thousands more teachers have joined the UK’s largest education union to take part in strikes on Wednesday, a union boss has said.

Kevin Courtney, joint general secretary of the National Education Union (NEU), said ministers should be concerned about the 40,000 new sign-ups to the union since the teacher strikes were announced a fortnight ago.

He said the new members, of which the vast majority are teachers, are joining the union “because they want to be part of the action”.

Mr Courtney said: “That’s a very big conscious decision to make, to join us at this moment. If I was the government, I’d be worried about that.”

The UK is facing the biggest day of industrial action in more than a decade on Wednesday as teachers, university staff, train drivers, civil servants, bus drivers and security guards will all go on strike.

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