Boris Johnson has officially taken over as London Mayor.

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Posted by: SV, Croydon on 9:35am today

Its all very well shouting Red and Blue slogans at each other, but three key tests for Boris will be 1) traffic congestion 2) crime 3) air pollution. Over the last eight years we have seen traffic congestion and crime falling every year. Real progress. Air pollution is set to fall because of the low emission zone.

These 'quality of life' issues must be matched by Boris in the next 4 years.