Police Officers say they fear a repeat of last summer's riots, according to a new study.
The research, carried out by the London School of Economics and the Guardian, also suggests that police don't have the resources to cope with such disorder.
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The online guide offers easy, moderate or fast options. But some busy junctions are given the same risk rating as a quiet backstreet.
Misty and murky tonight. A band of rain pushing across London from the south west from 9pm onwards.
It could be the world's biggest open air trampoline. The bizarre project has the backing of London mayor Boris Johnson.