Yes I remember listening in when Radio Caroline first went on air. I spent the Summer of '64 in Norfolk working with my uncle,  I think they were anchored off Felixtowe in the early days so reception there was excellent.  There were no dedicated pop music stations around before Caroline other than Luxembourg which led to a lot of knob twiddling trying to find a signal. It still took the BBC more than 3 years to finally come up with Radio 1 and I think that was mainly because they were losing so many listeners to the pirate outfits.

Happy days