The set-top boxes (STBs) with UHD-capable silicon (which will be first produced in 2014, and more widely available from 2015) could be shipped in volume; and the camera replacement cycle will see studios migrating further to 4K-capable cameras, benefiting existing HD capture in the process. By 2020, the early pay-TV operator adopters of HD will have achieved 100 per cent HD STB penetration, at which point rationalisation of SD and HD channels becomes possible. Then UHD...