A man was tonight being questioned about the death of a woman thought to be Eva Rausing, a member of the family behind the Tetra Pak drinks carton empire and one of the richest women in Britain, sources said.
Scotland Yard said that a body was found at an address in Cadogan Place, Chelsea, yesterday after a 49-year-old man was arrested on suspicion of possession of drugs.
The man was further arrested in connection with the death and is currently being held at a south London police station.
Mrs Rausing's husband Hans stands to inherit the £5.4 billion business enterprise built by his Swedish father, also named Hans.