 Some other changes took place, such as the Soke of Peterborough and Huntingdonshire being merged into Huntingdon and Peterborough, and the merger of the original Cambridgeshire with the Isle of Ely to form Cambridgeshire and Isle of Ely.The map shows the counties and county boroughs just prior to their abolition in 1974.In 1974 the administrative counties were abolished by the Local Government Act 1972 and replaced with the metropolitan and non-metropolitan counties of England.