Platt's career started at Trident Studios in London and eventually became an engineer at Island Studios. Working his way from assistant engineer on sessions with the likes of Traffic, the Who, the Rolling Stones, Led Zeppelin he started to engineer on sessions with Free, Sutherland Brothers, Paul McCartney, Jess Roden and Mott the Hoople. He went on to engineer the "Catch a Fire" and "Burnin"' albums for Jamaican artist Bob Marley which, it is claimed, would launch reggae music into the mainstream. This association led him to complete "Funky Kingston" for Toots & the Maytals and work with several other notable reggae artists such as ZapPow, Lorna Bennet, Harry J's All Stars, Aswad and the Cimarons.