They continued to meet and record until December 1993.But in new footage which has come to light today, a cameraman has spoke anonymously to The Sun about the tapes recorded of the royal in 1997 before she died.
The newspaper reports the cinematographer was working for the BBC when he was summoned to Kensington Palace late one night.
He was paid £5,000 for his time and kept a personal diary of his meetings with Diana, noting how she was determined not to let Charles become King.
Diana also spoke about her desire to stop Charles from becoming King, instead wanting her eldest son William to take up the position.
The camera operative put in his diary: 'She makes it clear that she would do everything possible to make sure Charles never became King.'She wanted William to succeed to the throne when the Queen died.
Under the law GCHQ would have needed to get the Foreign Secretary to sign off such a phone tap, which the agency had not sought, he said.
Ian Burnett QC, for the coroner, said at the time: 'And intercepting the Royal Family is simply not within the scope of the intelligence the government was seeking?
The tapes went missing and Mr Settelen became locked in a copyright battle with Diana's brother, following her death, for the rights to broadcast them.
He eventually won and was backed by NBC who wanted to broadcast the footage.
Minutes from a security meeting describing the inquiry into the Camillagate scandal were read to the London hearing into the death of Princess Diana and her lover Dodi Fayed in 2008.