Coroner Sir Robert Owen has upheld a request by Foreign Secretary William Hague to keep secret any evidence that Russian state agencies may have been involved in Alexander Litvinenko's death.
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Demonstrators have blockaded the entrance tunnel to Heathrow Airport in apparent protest at plans to build a third runway.
Unions have warned of a crisis on the Piccadilly Line after fresh disruption for travellers.
George Osborne told MPs London would shoulder a large part of his 37% reduction in transport funding.