Heather threatens to reveal Sir Paul's 'therapy' tapes in divorce battle

Miss Mills has hours of recordings of Sir Paul sharing his darkest inner thoughts with her as the couple tried to talk through their marital difficulties.

The Daily Mail has learned that the sessions were recorded on audio tapes at Sir Paul's Peasmarsh estate in West Sussex in 2005 so they could be played back as the couple "worked through" their problems.

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They are understood to make up the dynamite "box of evidence" to which Miss Mills referred in TV interviews this week.

The tapes apparently feature Sir Paul and her talking often heatedly and at length about physical fights and fidelity in his first marriage to Linda.

They are also said to row about his love of alcohol and cannabis, a row which turned physical between Miss Mills and the Beatle, his treatment of Heather behind closed doors and detailed discussions about their sex life.

There are also wider-ranging recordings where Sir Paul talks about his life before Miss Mills - including remarks about other members of the rock aristocracy and the McCartney clan.

The tapes have been described as "incredibly explosive".

Miss Mills said this week that she had death threats from an "underground movement" which made her want to kill herself so her four-year-old daughter Beatrice could live a safer life.

She then said she had taken steps to ensure that the "truth will come out" about their marriage if she was ever murdered.

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"I have a box of evidence that's going to a certain person should anything happen to me, so if you top me off, it's still going to that person, and the truth will come out," she said.

Last night, she continued her media onslaught against Sir Paul in the U.S.

During a TV interview she pointedly referred to having "recorded every single conversation" she had with Sir Paul as their marriage disintegrated because she thought "no one would believe her" about how the break-up was all his fault.

The recordings have remained secret until now. The Mail first learned of their existence last November when one found its way to a British TV company.

One of the tapes - said to contain Sir Paul admitting to Miss Mills that he hit Linda "once or twice" - surfaced again this week when it was played off-camera during a round of TV interviews in Britain on Wednesday.

There are other recordings which contain Heather and Sir Paul locked in discussions about the appropriateness of his level of his alcohol and cannabis consumption.

Another allegedly contains an admission from Sir Paul that he and Miss Mills came to blows during an argument.

Other more intimate recordings involve Sir Paul's feelings about sex with Heather, and what attracted him to her, talking in detail about the pros and cons of their sexual exploits.

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A source at a major British TV production company who has heard the tapes said: "Heather played edited excerpts from a number of audio tapes to us.

"She came for a meeting with her friend Ben Amigoni.

"They are long rambling talks between Heather and Paul - she describes them as his therapy sessions. We got the highlights. She told us that he was definitely aware that he was being recorded."

However, he added: "It didn't sound as if he knew he was being recorded - but that is just my opinion. Paul clearly loves to talk about himself, but he may be regretting that now.

"After Heather had left us that day, my opinion was that in isolation they were dynamite, but looked at in the context of an entire marriage, they might be quite unrepresentative of what actually went on."

A source close to Sir Paul defended his drink and drugs consumption, saying: "He does have a problem, but it's not anything to do with alcoholism.

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"His problem is with tolerance. If he has more than about three or four whiskies, he falls over. He simply cannot drink a lot.

"And in terms of the dope, I think the only problem he had was her ignorance about it.

"She's the one who went on regional TV and said that everyone who smoked cannabis should be put in prison."