 After the failure of Huntingdonshire to become a unitary authority, a Huntingdonshire Society was set up to promote awareness of Huntingdonshire as a historic county, and to campaign for its reinstatement as an administrative and ceremonial entity.In 2002 it established an annual "Huntingdonshire Day" on 25 April, the birthday of Oliver Cromwell.As a result of a campaign by the Huntingdonshire Society, the county flag of Huntingdonshire, a gold and beribboned hunting horn on a green field, was registered by the Flag Institute in June 2009.