With the growth of electronic music and home studios in the 1980s, the music industry began to change and Sheffield sold the studio. He founded one of the first
Apple Computer dealerships in the UK, importing early Apple computers from the United States in 1986, complete with
step-down transformers which enabled the machines to operate on UK voltage. The company also opened specially designed offices, known as a bureaus, to allow Apple and PC computer users to scan, print and use the Apple computers on a per-hour basis. Together with three of his sons founded the advertising agency Tableau, using his knowledge of the entertainment industry and experience from early desktop publishing. The agency was responsible for the early
EasyJet airline advertising campaigns and their first online booking system, and held other notable advertising accounts and went on to gain awards within the industry for its work. Prior to his death, Sheffield together with two of his sons and a former sound engineer from Trident Studios continued to work within the music industry and assisted in the development of a mobile music app named "Trackd" which allows musicians to record
collaboratively directly on a mobile device using an
8-Track mixer and also allows the apps' musicians to promote their music to a worldwide using the app platform promoted through
app stores. The App has been downloaded over a quarter of a million times to date and won awards for its innovation to
music technology. ==Death==