Workman 1: "Fancy a beer after fixing this buoy?"
Workman 2: "There is some bloke in that abandoned sea fort, look!"
Workman 1: "I wonder what he is doing up there. Is that a bloody gun?"
*BANG * BANG * BANG*
Workman2: "That cunt is mental, run!"
Understandably, Roy's royal presence was summoned to court in England to figure out what the hell that was all about. The courts ruled that Sealand was not part of England and Roy could do whatever he wanted there. Mighty England had been defeated by a man and his dream. And his petrol bombs and lunatic strength.
At this point you have to think only a unique type of moron would dare to mess with Roy. Meet Alexander G. Achenbach, prime minister of Sealand, who revolted and took Michael as his hostage. Oh, shit! Suffice to say, Alexander's coup ended with Roy coming back in his helicopter with a crack team of mercenaries. He took over the island and kicked all the idiots out. There is not much information about Roy's mercenaries, but we like to think they were Vietnam veterans on the run from the law for a crime they didn't commit.
Alexander Achenbach and his exiled government has this website where they complain about it and presumably await the day they can seize power once again.