It was they who were responsible for the 1954 adaptation of George Orwell's "Nineteen Eighty-Four", the second performance of which drew the largest television audience since the coronation, some seven million viewers, and is one of the earliest surviving dramas in the archive. The telerecording process had by now been perfected for capturing live broadcasts for repeat and overseas sales, although it was not until the early 1960s that the majority of BBC dramas were prerecorded on the new technology of videotape. The BBC, unlike American broadcasters, only gradually produced dramas shot entirely on film from the 1960s onwards; ITV's filmed series were in the minority, and most of the commercial channel's drama productions were made in the same 'hybrid' form as those of the BBC. Filmed sequences would be mounted for external scenes which would be pre-shot and inserted into productions at relevant points, later being inserted into shows at the video editing stage. "These sequences bought time for the more elaborate costume changes or scene set-ups, but also served to 'open out' the action," as the British Film Institute explained on its "Screenonline" website in 2004.