The King Of Scanlon's Rock

Ageing Rock God, Jim Sullivan, is heading for the quiet life on his newly acquired, tiny island, off the coast of Cornwall.
That is until he sends a letter to the queen, announcing his intent to declare independence from the UK and appointing himself king.
Determined not to cede one inch of British territory, the UK government despatches low-level Foreign Office researcher, John Cabot, to put a stop to Sullivan's ambitions.
What they didn't anticipate was Cabot's tenacity for unearthing information they'd rather he didn't, or Sullivan's relentless, but completely unfounded, optimism in his own ideas.
Armed with nothing more than a guitar and a spreadsheet, can these two stand up to the might of the British Empire?
No contest.