The Black Helicopters of Hackney

It’s an unmistakeable sound – the deep thukka-thukka of giant counter-rotating blades missing each other by milliseconds at a rate that blows the non-mechanical mind. Silhouetted against a winter Clapton sky the Chinooks – heavy-lift double-rotored helicopters that often swing by here on an afternoon (always north to south, usually in pairs) work their way…