The Queen issued an extraordinary slap down to David Cameron yesterday for blabbing about her intervention in the Scots referendum.
In an unprecedented rebuke, a Buckingham Palace source said the former PM's admission had caused a "an amount of displeasure” with the 93-year-old monarch.
A source also told the BBC that "it serves no one's interests" for conversations between the prime minister and the Queen to be made public and "it makes it very hard for the relationship to thrive".
Mr Cameron himself admitted yesterday that he should not have broken long-standing Royal protocol to reveal he had lobbied Her Majesty to make her controversial intervention just days before the knife-edge poll in September 2014.
Quizzed about it, Mr Cameron revealed he wanted Her Majesty to hit back at then-SNP boss Alex Salmond’s claim that the Queen would be happy to rule over an independent Scotland.
He said he had asked whether the Queen could “raise an eyebrow” ahead of the referendum - and days later Her Majesty said people should “think carefully about the future”.
Yesterday Mr Cameron admitted he had revealed "perhaps a little bit too much" about the controversial request to intervene.
He told BBC Radio 4’S Today programme: “Some people would think, possibly even me, that I’ve already said too much about this”.
But in an attempt to play down the row over his revelation, Mr Cameron later insisted he did not ask the Queen to do "anything improper" during the referendum on Scottish independence.
The former prime minister - who has been carrying out a media blitz to promote his memoirs - said: "I never asked for anything improper to be said or done."
Mr Cameron sought support from the Queen after a poll predicting a Yes victory "panicked" him.
He was also forced to apologise to the Queen after being overheard boasting that the Queen had “purred” down the phone when he told he had won the referendum.
Yesterday the former First Minister Alex Salmond revealed that the Queen had summoned him to Balmoral to assure him those “purring” comments were wrong.