An animated wind is bending tree branches, ripping petals off magnolia trees and making waves in the deep green grass that has sprung up in parks, squares and pavement-free soil around Hackney. En route to a pharmacy, I stopped in a small park in between the Greville and Rogate estates. A tower block, wrapped in blue fabric, was being constructed (or refurbished) at the far side of the park, sending drilling and hammering sounds into the wind.