Today more than 50,000 competitors will take part in a 100-mile road race on a route that starts in the Queen Elizabeth Olympic Park in east London, scene of last year's Games, before taking them into the Surrey countryside.
Rugby World Cup winner Matt Dawson, two-time Olympic rowing champion James Cracknell, former Olympic champion sprint hurdler Sally Gunnell and actor Gary Kemp are among the famous faces taking part.
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Dozens of women gathered on Westminster Bridge to form a human chain in a show of solidarity with the victims of Wednesday's terror attack.
In a wide-ranging Peston on Sunday interview, he said Parliament security needs reviewing and the PM's counter-terror strategy is flawed.
The terror attack carried out by Khalid Masood at Westminster that left four people dead lasted less than two minutes say police.