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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Fighting for their right to misuse nitrous oxide, approximately 60 or 70 protesters inhaled 'laughing gas' amid concerns over a clampdown.
The pilot, from the Gnat private display team died after the display aircraft he was in crashed near the CarFest event in Cheshire.
The annual cycling festival in London was the biggest ever this year - with more than 25,000 taking part today.