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Day was invited to join Swinging Radio England and was one of the original presenters and was there until the station closed six months later.
He then returned to offshore radio broadcasting with Radio North Sea International, whose then programme director, Larry Tremayne, dismissed him in 1970. He also briefly presented a breakfast show on the new Radio Caroline in the mid-1970s.
Since then, Day has been heard on many commercial stations throughout the UK including Manchester's Piccadilly Radio, Birmingham's BRMB, Radio West in Bristol, Invicta Radio/Invicta Supergold in Kent, Pirate FM in Cornwall, Jazz FM in London, County Sound in Surrey, Amber Radio in Suffolk and Fusion 107.3 in London.
Saga 105.7 FM
For some time after its inception in October 2001, Day was used as a relief breakfast show presenter, standing in for David Hamilton and Les Ross for Saga 105.7 FM in Birmingham. He then took over the Weekday Drivetime show from 4-8pm, (4-7pm on Fridays) and presented a three-hour show on Saturday mornings from 10am-1pm playing 1950s and 1960s tunes. He also hosted an hour-long show playing number ones on Saturday afternoons from 1-2pm.
Day has also been involved with a number of failed commercial radio stations with Nigel Reeve including Fusion Radio, Fresh FM, South West Radio Ltd, and YMC.
BBC Radio Kent
With the closure of Saga and its rebranding as 105.7 Smooth Radio in March 2007 Day presented a show for Smooth Radio. '60s Saturday' played music from that decade between 10am-1pm on Saturdays, but the show ended in September 2007 as Smooth Radio re-scheduled some of its programmes.
Day then moved stations and began presenting a daily show on BBC Radio Kent every weekday evening from 7-10pm, this show can also be heard on six stations (BBC Radio Kent, BBC Sussex, BBC Surrey, BBC Radio Solent, BBC Radio Berkshire and BBC Radio Oxford) in the South and South East of England. The programme features the best music from the past 6 decades plus in depth interviews with those who made it. Recent interviewees include Ray Davies, Marianne Faithfull, Sir Cliff Richard, James Morrison, Michael McDonald, Mick Fleetwood, Florence & The Machine, Foreigner and Mr. Hudson. Until summer 2010 he also presented a Sunday afternoon show from 2-5pm only on BBC Radio Kent.
As of the DQF proposals for the BBC being approved on 16 May 2012, his programme for BBC radio stations in the South and South West were replaced by a new cross-England show on all BBC local stations.
As of early 2013, Roger Day has a weekly show on BBC Radio Kent taking over Dave Cash's classic countdown show in 2017 and a daily show on the Internet.
Day was nominated for Radio Show of the Year for the Music Week 2012 Awards alongside Chris Evans, Steve Lamacq, Mistajam and Ronnie Wood. The winner was Steve Lamacq of 6music.
Day can also be heard presenting regular shows on the satellite version of Radio Caroline, which he has been doing since 2003.