ANTI-MONARCHY group Republic will stage the largest protest action in its history on the King’s coronation day.

The group’s chief executive, Graham Smith, said activists will chant “Not my King,” wear yellow T-shirts and carry yellow placards in groups along the procession route and also gather for a major demonstration in Trafalgar Square on May 6.

Mr Smith has vowed to make the peaceful demonstration unmissable and loud in the day of action, which more than 1,350 people have pledged to take part in so far.

He branded the crowning of Charles Windsor and the Queen Consort a “pointless piece of theatre” which will cost tens of millions of pounds and be a “slap in the face” for people struggling with the cost-of-living crisis.

“Anti-monarchy protests will carry one simple message: Do you want Charles or do you want a choice?” he said.

The campaigners have written to every police force in Britain asking for reassurances they will not interfere in “peaceful and meaningful” protests against the monarchy.

Protesters have already targeted Charles at recent public appearances.

Republic is asking people to sign a pledge to protest and to add their voices to their call for Britain to become a republic, with an elected head of state.

“On Saturday May 6 the eyes of the world will be on the coronation,” the group said in a statement online.

“This is the moment we make our objection loud, visible and impossible to ignore.”

A YouGov poll this week found that 51 per cent of adults believe the coronation ceremony should not be funded by the government.

The event is set to cost millions of pounds. Elizabeth Windsor’s coronation cost £912,000 in 1953 — equivalent to £20.5 million today.