Anguilla is a British Dependency. May 30 is Anguilla day.
The national flag of Anguilla consists of a Blue Ensign with the British flag in the canton, charged with the coat of arms of Anguilla in the fly. The coat of arms consists of three dolphins, which were featured on the earlier Anguillan flag, and which stand for friendship, wisdom and strength. It was adopted on May 30th,1990.
On 27 February 1967, Britain had granted the territory of Saint Christopher-Nevis-Anguilla the status of "associated state", with its own constitution and a considerable degree of self-government. Many Anguillans strenuously objected to the continuing political subservience to Saint Kitts, and on 30 May (now known as Anguilla Day), the Saint Kitts police were evicted from the island.
The island's first flag was a red blue flag featuring the name of the island in yellow and two mermaids. Variants to this flag were also widely used, with some substituting red for purple and some not bearing the name of Anguilla. This flag was widely disliked, and was replaced during Anguilla's brief period of independence by the Dolphin Flag, which is still widely seen around the island. This flag was a banner of the arms found on the current flag, and was white with a broad blue band across the base of the flag, above which were three stylised golden dolphins. It was adopted in 1990.