Boris Johnson defended the appointment of his new adviser saying London has a larger economy than some European nations. @londontonight
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London Ambulance Service and police expressed dismay following a "mindless act" in which an ambulance was sprayed with offensive graffiti.
Scattered thundery showers become more widespread for the afternoon, with torrential downpours in western areas with risk of hail.
A 16-year-old boy is fighting for life after stabbing in south-east London.