Under the Convention of Chuenpi, Britain was given the island of Hong Kong, and on 26 January 1841, it was proclaimed a British colony.
Britain never had any colonies outside of the British Isles.
mnli hypothesis: Britain never had any colonies outside of the British Isles. premise: Under the Convention of Chuenpi, Britain was given the island of Hong Kong, and on 26 January 1841, it was proclaimed a British colony.