Dedicoat joined BBC WM at Pebble Mill in 1979 as a presenter, before moving to BBC Radio Devon four years later. After his time in the West Country, he moved to London to join the Presentation Department of BBC Radio 2 in 1986 at Broadcasting House, and later became its head, a position he retained until his retirement on Friday 27 March 2015. As part of this job, he read the news on BBC Radio 2's weekday breakfast programme, "Wake Up to Wogan", before its demise in December 2009, as well as on Sarah Kennedy's show until she left the station in August 2010. He then became the newsreader for Vanessa Feltz in January 2011, but following a reshuffle of newsreaders in September 2012, his final shift was reading the news on weekdays between 10am and 5pm. He was also the voice of Radio 2's "emergency CD" (played when there is a fire alarm or other unforeseen break in programming) and their multiple choice automatic phone menu.