Billy Chiu first gained public attention in Hong Kong when he waved the British colonial flag at protests three years ago.

On Sunday the activist goes one step further in his crusade against the city’s Chinese rulers, when he establishes a political party to campaign for a return to British rule.

Such a policy is considered laughable by many in Hong Kong. But Mr Chiu says re-establishing links with the UK is "transitional" and a means for the city to sever its ties with China.