The flag of Montserrat consists of a Blue Ensign with the British overseas territory's coat of arms. Adopted in 1960 to supplement the Union Jack after the dissolution of the British Leeward Islands the year before, it has been the flag of Montserrat since the territory was granted self-government that year. To coincide with the Diamond Jubilee of Elizabeth II in 2012, the Foreign and Commonwealth Office started flying the flags of overseas territories over its Main Building in Whitehall to commemorate a "significant day in each of their respective histories".