On 1 April 1965 a number of changes came into effect. The new administrative area of Greater London was created, resulting in the abolition of the administrative counties of London and Middlesex, at the same time taking in areas from surrounding counties. On the same date the new counties of Cambridgeshire and Isle of Ely and of Huntingdon and Peterborough were formed by the merger of pairs of administrative counties. The new areas were also adopted for lieutenancy and shrievalty purposes.