A Londoner has died during an expedition in the Arctic with two friends when the group got into trouble. They started their attempt to cross the Greenland ice cap on April 19 in a bid to raise more than £5,000 for the The Queen's Nursing Institute.
The two other British men are being treated in hospital.
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RMT members staged a protest outside Parliament to mark the anniversary of the first strike one year ago today.
The former mayor of Tower Hamlets, was forced to step down after he was found guilty of a string of corrupt and illegal practices.
The service is the first to be held in the singer's honour since the private funeral held by the family at Highgate Cemetery on March 29.