Heather calls in the experts to prove Paul DOES have £800million

Heather Mills has told friends she is employing a team of forensic accountants to examine her former husband's finances

Heather Mills is trying to prove Sir Paul McCartney is worth much more than the £400million he claimed in their divorce battle.

She has told friends she is employing a team of forensic accountants to examine her former husband's finances.

Such information, she hopes, will lead to the divorce ruling being overturned and see more money go to their daughter Beatrice, four.

In her impromptu press conference after the divorce hearing at the High Court, Miss Mills said: "We all know he's worth £800million. He's been worth £800million for the last 15 years."

The Sunday Times Rich List put the former Beatle's wealth last year at £825million.

Miss Mills, who was awarded a £24million settlement, had recruited accountancy firm Lee and Allen in an attempt to discredit Sir Paul's own valuation of his wealth.

In the judgment last week, Mr Justice Bennett confirmed that many of the requests for information made by Lee and Allen were declined by the court.

Miss Mills intends to take on another accountancy firm to examine Sir Paul's music rights, business assets and properties such as his Peasmarsh estate in East Sussex.

She claims to have recordings of her ex-husband telling her he is worth at least £800million.

Dr Philip Beresford, who compiles the Sunday Times Rich List, said: "All I would say is that we were surprised that the valuation of the music rights and business assets were so low.

"Also we wonder what has happened to Linda McCartney's money - she was worth some £150million when she died.

"Also the (McCartney) children all seem to have gone very quiet. They were bleating before about money.

"We were wondering whether he had given them some slabs of money first to keep them quiet and then to keep them off his balance sheet. We were certainly surprised by the figures.

"Obviously it is in the interest of his accountants and himself to keep the figure as low as possible."

Scroll down for more...

In her impromptu press conference after the divorce hearing at the High Court, Heather said of Sir Paul McCartney: 'We all know he's worth £800million'

Miss Mills has told friends she cannot look after Beatrice on £35,000 a year, the sum awarded at the High Court.

One said: "Heather says she can prove the amount of money that is being given to look after Bea will not last over the year. She is putting it to the test.

"Even with Bea travelling in economy Heather says it's not enough. She is keeping every receipt - including her invoice to her security team - to show that £35,000 is just not sufficient.

"Heather's thinking is that Bea should not be seen to have a different lifestyle when she is with Heather compared to Paul - and she is going about proving that is not possible.

"Heather is hoping Paul will discretely make a payment to her annually rather than want to go back to court and rake all this up again."

Scroll down for more...

Happier times: The McCartneys' marriage ended in a bitter divorce with Heather winning a £24million settlement

However, a legal source pointed out last night: "Mr Justice Bennett made the ruling based on Heather's need and also based on the standard of living the couple enjoyed when they were together.

"It is quite possible that even if Heather proves that Paul was worth £800million, it would not greatly affect the ruling. It is certainly not a given that she would even be granted leave to appeal."

Receive our newsletter