Prince Charles wrote numerous letters to former BBC Director General Mark Thompson commenting on the organisation's programmes, The Daily Telegraph reports.
According to the newspaper's investigation, the heir to the throne used the correspondence to voice both "positive and negative" opinions about content that was aired.
The BBC will not however be releasing details or copies of the Prince's letters, saying it wanted to "maintain a safe space for public bodies to debate issues with the Royal Household away from public scrutiny."
As well as his dialogues with the BBC, it was revealed the first-in-line regularly wrote to officials in Tony Blair's government.
Last month, three judges ruled it was in the public interest to release the "particularly frank" missives, and demonstrate how a senior member of the royal family was in communication with ministers on a weekly basis.
However, Attorney General Dominic Grieve has now blocked the move to protect Charles' credibility as future monarch.
Mr Grieve said: "If he forfeits his position of political neutrality as heir to the throne, he cannot easily recover it when he is king.”