Hans Rausing, one of the richest men in Britain and heir to the Tetra Pak drinks carton empire, has been arrested in connection with his wife's death after her body was found at their home in Chelsea in west London.
Her death was being treated as unexplained.
Mr Rausing had earlier been detained by police on suspicion of possessing drugs.
More top news
Labour left-winger Jeremy Corbyn is on course to become party leader according to private polling which suggests he has a 22 point lead.
Another disappointingly breezy and cool day for late July and a similar theme tomorrow.
The son of a coke plant foreman has won the right in principle to seek compensation for his father's death from respiratory problems.