Earlier this evening we watched Andrew Marr eulogising about mega-cities in glorious HD. Mexico City, London, Dakar and Shanghai were explored and flown over repeatedly. The sights, sounds and smell presented a chaotic but optimistic picture of a crammed and constrained life that never looked quite as unpleasant as the narrative wished to make it. One day we'll all live like this, in silver suits, dining as fregans from dumpsters, cycling and colliding, sleeping in stacks and escaping to the tranquility of floating farm's fields when we need a break from our fellow travellers. The mass conscience will rule and provide purpose but the wit and guile of the citizens needs to set and keep the rules; the citizens own the city after all. I wonder if that ever occurred to David Cameron or Nick Glegg?