The government has launched a major advertising campaign to ensure that all Londoners know about the referendum on London's mayor on May 7.

Launching the campaign at Wembley Stadium on Monday deputy prime minister John Prescott said: "This is very important decision indeed for Londoners and we want to make sure that everyone has the opportunity to take part. Voters can say `yes' or `no' to our proposals for an elected mayor and assembly.

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