Around 70 firefighters are tackling a blaze at a factory in Greenwich. Smoke can be seen across south-east London. There are swimming pool chemicals involved and people in the vicinity are being advised to keep windows and doors shut.
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A Met Police officer was left red-faced after attempting to stop a cyclist riding along a dedicated cycle path.
The number of people allowed into official spectator areas will be cut by a fifth with just 100,000 tickets available.
The mayor was being challenged by Labour following his selection as the Tory candidate for the safe seat of Uxbridge and South Ruislip.