David Cameron sought support from the Queen during the Scottish independence referendum campaign after a poll predicting a Yes victory "panicked" him, the ex-prime minister has said.
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Cameron made contact with Buckingham Palace officials in 2014, suggesting the monarch could "raise an eyebrow" in the close-fought campaign.
The former PM said he took the action after he felt a "mounting sense of panic" after a poll put the Yes to independence campaign ahead for the first time while he was staying at Balmoral.
He told the BBC that the poll findings felt like a "blow to the solar plexus" and led to a "mounting sense of panic that this could go the wrong way".
"I remember conversations I had with my private secretary and he had with the Queen's private secretary and I had with the Queen's private secretary, not asking for anything that would be in any way improper or unconstitutional, but just a raising of the eyebrow, even, you know, a quarter of an inch, we thought would make a difference."
A few days before the referendum in September 2014, the Queen told a well-wisher in Aberdeenshire that she hoped "people would think very carefully about the future".
The comment was seized on by many pro-union campaigners as an indication that the Queen was urging voters to keep the UK together.
Referring to the Queen's remarks, Cameron said: "It was certainly well covered (by the media) ... Although the words were very limited, I think it helped to put a slightly different perception on things."
Scotland voted to remain in the UK by a 55 per cent to 45 per cent margin.
A documentary about Cameron's time in power also reveals that former chancellor George Osborne believed the Brexit referendum result was partly due to Cameron stoking the idea that "Brussels was to blame".
Osborne told the program: "We held a referendum we should never have held", and "the consequences for the country are grave".
He attacked Cameron's approach to the issue, saying: "David Cameron was just one of a number of British prime ministers who had fed this idea that we were different than Europe, that Brussels was to blame and that the public ultimately had to have a say, and we've all paid a price for it in my view."
Australian Associated Press
