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The weekend saw another flurry of revelations that illustrates just how far relations between the warring couple have sunk. McCartney has frozen their joint bank account after allegedly discovering that his wife has withdrawn around £1million in one month. He also changed the locks on their London home.

And in a sign of the pettiness now infecting proceedings, Paul is said to have instructed his solicitors to send Heather a legal letter after her nanny took three half-empty bottles of cleaning fluid from his Sussex farmhouse to clean Heather’s nearby office.

‘These past few weeks have been really tough on Paul, and although he initially wanted a “quickie” divorce, things have not gone according to plan,’ said a source close to the musician.

‘He and Heather hardly talk any more. Paul feels that Heather is taking the mickey by coming round to his private estate whenever she feels like it and expecting to be treated by his staff as she was when they were married.

‘The climax of this past week, though, occurred when Paul froze his and Heather’s joint bank account. It was very much a last-ditch measure, but came about when he discovered that she’d

been steadily taking out obscene amounts of money over the past four weeks.

‘He has always been very generous with his money, especially towards Heather and their charities, but now that they are divorcing, the maxim “What’s mine is yours” no longer applies.

‘When Heather recently went to draw out some more cash on her credit card, she was mortified to discover that she’d been barred.’