Investigative reporter Heid Blake receives a tip on the death of a multi-millionaire property tycoon, leading her to uncover a web of death that entangles Russian oligarchs, 10 Downing Street and Washington, D.C. Ser across Vladimir Putin’s two decades in power, Once Upon a Time in Londongrad charts how the UK became reliant on Russian money and missed opportunities to contain the Kremlin. 　　Once Upon a Time in Londongrad, a six part series based on BuzzFeed News reporting, airs on Sky Documentaries from 31 May.