The Duke of Cambridge will not attend the event at London's ExCel centre as he remains in Anglesey in his role as an RAF search and rescue helicopter pilot, a St James' Palace spokesman said.
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David Cameron is to put working people "front and centre" of his economic plan our economic plan" if the Conservatives win the election.
Nearly 38,000 runners will hope to complete Sunday's London Marathon making it the biggest event in its 35-year history.
Rain across central Britain with longer, intense downpours with thunder in places this evening. A lucky few will stay sunny and dry.