If anyone's interested, they're actually still around as a licensed station and have been doing quite well recently. They have a cool mix of old and new where their ship's aerial actually transmits the studio's output over 4G which is relayed to a much more efficient land-based AM transmitter ironically based at a former BBC World Service site. They're on 648 kHz in south-east England, DAB in various British cities, and online.
Personally I recommend listening on a nearby SDR, it's before my time really but there's something cool about the aesthetic of crackly old MW in my opinion. This one usually has a good signal: http://grimsbysdr.ddns.net:8073/
The head of music at radio Forth when it established in Edinburgh as the first commercial radio station in town was a zetlander who'd been on radio NorthSea. I think anything after that was a let-down.
Radio Caroline was a bit before my time -- anyone remember Atlantic 252? Sure sounded like crap (longwave/mono) but the music was great and you could tune in all over the UK and never lose it no matter where you drove.
Personally I recommend listening on a nearby SDR, it's before my time really but there's something cool about the aesthetic of crackly old MW in my opinion. This one usually has a good signal: http://grimsbysdr.ddns.net:8073/