Ronan O'Rahilly's Radio Caroline is probably the best-remembered of the offshore pirate radio stations.
The one with the most bizarre history, though, is probably Radio North Sea International. At this distance of time it is difficult to believe that such a radical concern would lend its support to the Conservative party, but there is evidence that pirate radio campaigns made a small but significant contribution to the General Election vote that brought the Tories into power in June 1970.
I recall coming home from school a year later to find that this was the lead story on the BBC 1 TV News:
The perpetrators were employed by a rival station, Radio Veronica. (The background music - Man of Action by the Les Reed Orchestra - was RNI's theme tune.)