Multi-millionaire Charles Saatchi has been accused of using the trial of his two former personal assistants to attack his ex-wife Nigella Lawson.

Television cook Nigella Lawson was unhappy in her marriage to Charles Saatchi and was blocked from working abroad by him, her former personal assistant has told a court.

Jurors in the trial of two former personal assistants accused of defrauding Nigella Lawson and Charles Saatchi have been warned to ignore comments made by British Prime Minister David Cameron about the celebrity cook.

Charles Saatchi’s accountants did not scrutinise the credit cards used by his and Nigella Lawson’s personal assistants, because it was not their job to get involved in the household expenditure, a court has heard.