The Eastern Number 4 branch of the Communication Workers Union (CWU), Sheffield Green Party and Rotherham Hospital Unison branch are the latest organisations to back the 3 October protest.
The demonstration, called by the Right to Work campaign, has already been backed by three national trade unions—the PCS, NUJ and UCU—as well as the Labour Representation Committee.
Paul Turnbull, CWU area processing rep in Cambridge said his committee backed the protest unanimously.
“The Tories plan to drive through the privatisation of Royal Mail, making thousands of workers redundant,” Paul told Socialist Worker.
“We are going to make sure that postal workers take up their seats on the coach sponsored by Cambridge trades council. We have to add our voices to the chorus of thousands of other workers opposing the cuts.”
Speakers confirmed for the pre-march rally include Labour MPs Jeremy Corbyn and John McDonnell, PCS general secretary Mark Serwotka, Romayne Phoenix of the Green Party, Dr Jacky Davis from Keep Our NHS Public, Birmingham Respect councillor Salma Yaqoob, and Linda Burnip from the Local Housing Allowance Reform Group.
A Greek trade unionist, Portuguese Left Bloc MP Jorge Duarte Costa, and a representative of Germany’s left wing Die Linke party will speak at an international rally after the demonstration.
Coaches have been booked from more than 30 cities and towns across Britain.