In post-WWII London, residents of the Pimlico neighborhood stumble upon a buried treasure and an ancient document during construction work. The document reveals that their area legally belongs to the Duchy of Burgundy, not Britain, meaning they aren't subject to British rationing or post-war austerity measures. The residents gleefully embrace their newfound independence, setting up their own laws and customs, while relishing in the freedom from British regulations. This newfound autonomy attracts various outsiders looking to exploit the situation, causing a surge of entrepreneurship and trade in the small enclave.

As word spreads about Pimlico's unique status, the British government finds itself at odds with the residents, leading to increased tension and a series of bureaucratic and social challenges. The community faces obstacles in maintaining order and services as their independent stance leads to isolation and resource shortages. The situation intensifies, drawing media attention and highlighting the ingenuity and resilience of Pimlico's residents as they navigate these complications. Threads of humor and satire weave through their efforts to sustain their independence, exploring themes of identity, unity, and the complexity of sovereignty.