The heir to the multi-billion pound Tetra Pak drinks carton empire and his wife have been charged with drugs offences.

Scotland Yard said Hans Kristian and Eva Rausing were charged yesterday and will appear in court later this month.

The couple were arrested in April after Mrs Rausing allegedly tried to smuggle small amounts of crack cocaine and heroin into the US embassy in London.

Their house, in Chelsea, south-west London, was subsequently searched.

A spokesman for the Metropolitan Police said today: "Eva Louise Rausing, 44, of Cadogan Place, Chelsea, was charged on July 13 with possession of Class A and Class C drugs.

"Hans Kristian Anders Rausing, 45, of Cadogan Place, Chelsea, was charged with possession of Class A drugs."

The couple were bailed to appear at City of Westminster magistrates' court on July 29.

Mr Rausing's father, also called Hans, is a Swedish billionaire who built up the Tetra Pak empire with his late brother Gad.

His fortune is said to be around £5.4 billion, putting the family seventh on the Sunday Times Rich List.