At £150million, it could be the most expensive decorating job in history.

Sarah Pursglove and Robert Oesterlund had called in Azadeh Banai to transform their penthouse suite.

But the designer and Mr Oesterlund, 43, soon fell for each other, destroying his 14-year marriage to Miss Pursglove. The 46-year-old has now opened divorce proceedings – seeking £150million – half their fortune.