Campaigners have written to David Jordan, the BBC's director of editorial and policy standards, ahead of the coronation, strongly condemning the broadcaster's royal coverage.
Graham Smith, writing for campaign group Republic, said in the letter that the complaint is "particularly urgent in light of the forthcoming coronation" and that Republic is "seeking a number of assurances."
With polls showing as few as 15% enthusiastic about the coronation the BBC stands accused of serving a shrinking minority of people.
Asking Jordan for a meeting, the letter accuses the BBC of failing "completely and comprehensively to be impartial in its coverage of the monarchy or to give voice to a reasonable balance of views on the issue."
It goes on:
"The evidence suggests the BBC not only fails to be impartial, but makes no attempt to be impartial or balanced and, most shockingly, openly colludes with the Palace in its coverage."
"It should be a source of deep shame for all those involved that, instead of such fearless reporting, we have insipid, vacuous and dishonest coverage from a BBC that is fearful of public opprobrium and Palace influence."
The BBC is accused of failing to hold the monarchy or the monarch to account, failing to reflect public opinion, misleading the public, misrepresenting the issue and excluding the views of millions of people around the UK.
Speaking today, Graham Smith said:
"The result of the BBC's failures is that the coverage serves the interests of a shrinking minority who could reasonably be called royalists. In doing so they do a disservice to the whole nation."
"A recent YouGov poll showed only 15% of the public are enthusiastic about the coronation, with a majority not interested. The BBC's coverage will suggest the opposite is true."
"We met with David Jordan in 2011, when the BBC said they would achieve balance 'over time'. Twelve years later and we're still waiting."
"The BBC routinely misrepresents the monarchy and public opinion. They suggest the nation is celebrating major events when that simply isn't the case, and the only expert opinion they invite on is that of royalists whose expertise is often little more than opinion and speculation."
"Support for abolition of the monarchy has climbed over 30% and support for the monarchy among people under 40 has dropped below 50%. Yet none of that is reflected in the BBC's coverage."
"Three weeks out and BBC news programmes have made no attempt to engage with the organised opposition or to tackle the serious questions surrounding the royals."
"The BBC's failures are only compounded by their open collusion with the Palace, allowing the royals to airbrush anything they don't approve of from future broadcasts."
"We will continue to raise this issue with the BBC and will take it to Ofcom if necessary."
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