Litvinenko – The investigation into the death of a dissident is the TV series airing tonight on Sky. PHOTOGRAPH

The sequence is govt produced by Patrick Spence of ITV Studios (a spy amongst associates, Ralph and Katie), Josephine Zapata Genetay for NENT Group, Lucy Bedford for Tiger Side Productions (Three Little Birds, views, Good Karma Hospital), George Kay, Jim Subject Smith, and David Tennant. Richard Kerbaj is co-producer of Livedrop Media (Searching KGB Killers, Unmasking Jihadist John: Anatomy of a Terrorist)