The world athletics championships in London next month are expected to have the highest attendance figures in the event's history after organisers announced today that more than 650,000 tickets have been sold. The championships, which began in 1983, have completely sold out for the opening night at the London Stadium when Britain's Mo Farah will bid for his third successive gold in the 10,000 metres. More than a quarter of a million spectators are expected over the first weekend with the highlight set to be Jamaican Usain Bolt's final major 100 metres race.