Colin started his radio career reading news on Radio Caroline in 1965.
Despite this, she returned to Radio Caroline in March of that year.
It was also the first record played by Radio Caroline after a long period off the air.
He also briefly presented a breakfast show on the new Radio Caroline in the mid-1970s.
Day can also be heard presenting regular shows on the satellite version of Radio Caroline, which he has been doing since 2003.
The best known of these was Radio Caroline whose transmissions began in 1964.
Radio Caroline returned to the air on 15 April 1979.
Radio Caroline still broadcasts on satellite but requires manual tuning.
The next day, Radio Caroline was off the air as there had been a short circuit in the aerial.
Early in 1982, new investors were found for Radio Caroline.