Aerial view of the financial heart of London, at twilight as the sun, has set and the lights of the skyscrapers start to shine

london river thames river thames twilight lights bus cars road bridge barge hotel greenwich buildings skyscrapers traffic night flickering shimmering rooftop sunset skyline boats capital city clouds flashing lights aerial drone birdseye uav events tourists red bus arena stadium sky skies people attractions isle of dogs hsbc barclays citi bank finance dock cranes construction hyperlapse