Sadiq Khan gave a cheeky wink as he officially accepted the office of mayor of London.
He signed the declaration in front of hundreds of well-wishers at Southwark Cathedral.
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The historic ship, now a visitor attraction in Greenwich, first sailed from Dumbarton where she was built, to London.
Sana Muhammad suffered catastrophic internal injuries and died while her unborn son was delivered by Caesarean section and survived.
Members of the Rail, Maritime and Transport union on the Victoria line were due to walk out for 24 hours from the evening of November 27