Cherie Blair was joined by a host of VIPs and participants who took part in a 5K charity run/walk in support of International Widows Day.
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Giroud was clocked at 60mph in a 50mph zone on the North Circular in Willesden.
Police have arrested a lookalike of Friends star David Schwimmer, who failed to turn up at court before Christmas.
The driver of the car, who stopped at the scene and was taken to hospital with non life-threatening injuries, is helping police.