ANTI-MONARCHY activists have attached a polling station sign to the railings of Buckingham Palace.

At around 8am on Wednesday the two activists placed the 2-metre sign to the gates, declaring the royal residence a polling station as part of a campaign demanding a public vote on the future of the monarchy.

Republic, a group which campaigns for an elected head of state, said it is the first in a series of protests in the run-up to King Charles's coronation.

READ MORE: Man threw egg towards King because he felt ‘visit to poor area was in bad taste’

Graham Smith, CEO of Republic, said: "We want to drive home the need for a vote on the future of the monarchy. We should be able to decide, do we want Charles or a choice?"

"Within a few days thousands of people have signed a petition calling for a public vote on the monarchy. We're expecting tens of thousands more to add their name to the demand over coming weeks."

"We're calling on people to put up their own polling station signs around the country at 6pm every Tuesday. It's time to drive home this message, that the people deserve a vote."

"Republic is planning stunts and protests over the coming weeks and will be staging a large demonstration at the coronation in May."