London is a centric city. The typical commute heads inwards towards a Zone 1 workplace. But London can also be seen as a collection of smaller towns, each with its own central area. The latest exhibition at New London Architecture looks at plans to regenerate these local town centres and thus shape a 'polycentric city'. Opening with reference to 'the Mayor's 'blue doughnut' conjures up all kinds of improbable, possibly sordid images, until you......