Pirate pop radio evolved in the UK during the 1960s to challenge the BBC’s mediocre output and monopoly of the airwaves. Welsh based Radio Seren was in the vanguard of this movement, and had one feature missing from the more familiar names - a ship to shore postal service from the G.S. Venus for the DJs to reply to their numerous and adoring fans.
The common stamp used showed an image of the Venus, but different issues commemorated events in the history of the station. It would seem that life aboard was rather eventful, with some rather fanciful stories (perhaps retellings of other more familiar events). A couple of the more famous DJs also had their own stamps printed, while a rather famous New York pop artist provided a take on one his own works for another rather collectable stamp
Like all the other pirate stations Radio Seren effectively came to an end in 1968 with the launch of Radio One, the DJs finding work opening supermarkets or doing travel reports for local radio, and the Venus finding retirement at the bottom of the Bristol Channel.