It’s a spectacularly beautiful early morning in December and the traffic is rolling past indifferently on one of North London’s less than silent streets. I’m standing in front of a large red door, having come to visit David King and his world-famous collection documenting the extraordinary visual history of the Soviet Union. King has been assembling the collection for almost five decades and now it is in the process of being transferred to the archives of Tate Modern. The collection has always run in parallel to his work as a graphic designer, photographer and author – work, it is fair to say, that shows influence from the Bolshevik-era material he has discovered on his many visits to the former USSR, and which he has often drawn from in his books, posters, photographs and graphic work.