One of the heirs to multi-billion pound Tetra Pak, the world’s largest packaging group, has been arrested on suspicion of possessing crack cocaine and heroin, police and diplomats confirmed on Thursday.

Hans Kristian Rausing was arrested on suspicion of possessing Class A drugs at his home in Chelsea after his US-born wife Eva was detained by security staff at the US embassy in Grosvenor Square and subsequently arrested by British police.