One of the personal assistants accused of defrauding Nigella Lawson and Charles Saatchi was “cagey” and “secretive” about where she got her designer clothes and spent most of the time at work on Facebook, a court has heard.

Nigella Lawson is to be interviewed by Oprah Winfrey.

Two sisters accused of spending almost £700,000 (€836,000) on credit cards belonging to Nigella Lawson and Charles Saatchi wrote to the couple begging for forgiveness, a court has heard.