Since the micronation is unrecognized, within the territorial claim of the UK and easily within reach of their law enforcement, I wonder what the Principality of Sealand would have to do before the UK attempt to enforce their laws on them. Would the huge pressure of recording and film industries have enough power to compel them? Sealand have gotten into serious armed shenanigans before, which if one chooses not to interpret their governance as valid, would effectively be ransom.
Their wiki page mentions HavenCo, a data haven which apparently was operational for a few years.