The Local Government Act 1888 created four small neighbouring administrative counties in the east of England: Cambridgeshire, Isle of Ely, Huntingdonshire and the Soke of Peterborough. Following the Second World War, a Local Government Boundary Commission was formed to review county-level administration in England and Wales. The commission was of the opinion that counties needed to have a population of between 200,000 and 1 million to provide effective services. Accordingly, they recommended the amalgamation of all four counties into a single entity. The commission's recommendations were not carried out, however. The reform of local government was returned to in 1958, with the appointment of a Local Government Commission for England. The four counties were included in the East Midlands General Review Area, and the LGCE made its draft proposals in April 1960. The commission identified particular problems in the administration of Cambridgeshire, where the city ofCambridge had 50% of the population and over two-thirds of the rateable value of the county. Cambridge was large enough to qualify for county borough status and be removed from the administrative county, but it was felt that this would render the remainder of Cambridgeshire, which would consist of three rural districts, too small to effectively deliver local services. The LGCE made draft proposals to constitute Cambridge a county borough and create a new administrative county by merging the remainder of the county with the Isle of Ely, Huntingdonshire and the Soke of Peterborough. There was considerable opposition to the draft proposals, and the LGCE instead opted in its final report in 1961 to create two counties: Huntingdon and Peterborough, and Cambridgeshire and Isle of Ely, with Cambridge continuing to form part of the latter county. The Cambridgeshire and Isle of Ely Order was made on 14 February 1964, and placed before the House of Commons on 9 March 1964. The amalgamation was opposed by Sir Harry Legge-Bourke, MP for the Isle of Ely, noting that his constituents "in general were in favour of continuing with an independent county council with which they were entirely satisfied." Legge-Bourke asked why the Isle was to be abolished as a county, when Rutland was being retained, and went on to state that some parts of the area had more interests in common with Peterborough than Cambridge. The MP for Cambridge, Sir Hamilton Kerr also objected to the creation of the new county, advocating the original draft proposals and the elevation of his constituency to become a county borough. Nevertheless, the order was approved by 144 votes to 84. The new county was formed on 1 April 1965 from the areas of the administrative counties of Cambridgeshire and Isle of Ely less Thorney Rural District. As well as becoming an administrative county, Cambridgeshire and Isle of Ely also became a county for other statutory purposes. Accordingly, the Lord Lieutenant of Cambridgeshire was retitled Lord Lieutenant of Cambridgeshire and Isle of Ely. A High Sheriff was also appointed to the new county, and a single commission of peace and court of quarter sessions established. On the creation of the county an order under the Police Act 1964came into force creating the Mid-Anglia Constabulary by merging the Cambridge City Police, Cambridgeshire County Constabulary, Isle of Ely Constabulary, Huntingdonshire Constabulary, and the Peterborough Combined Police Force. On further local government reform in 1974 this became the present Cambridgeshire Constabulary with the same boundaries. The county ranked 33 out of 46 by population.
Districts
The county was divided into twelve districts: two municipal boroughs, four urban districts and six rural districts. The districts, which were transferred from the previous administrative counties, were:
† Formerly in Cambridgeshire ‡ Formerly in Isle of Ely
Coat of arms
The county council was granted armorial bearings by the College of Arms on 1 September 1965. The coat of arms was a combination of those of the two merged county councils. The blazon of the arms was as follows: Or a double tressure flory counter flory gules, overall on a bend wavy azure three crowns or; the shield ensigned by a mural crown or. Supporters: on either side a great bustard proper, the exterior leg resting on a closed book gules, garnished or. Badge: Within an annulet issuant therefrom four fleurs-de-lys in cross an open crown or. The gold field and red tressure flory counter flory were taken from the royal arms of Scotland. This was in reference to the fact that the Earldom of Cambridge was held by David I of Scotland in the twelfth century. The blue wave represented the River Cam on which were three crowns from the arms of the Diocese of Ely. The supporters were great bustards, a bird extinct in England, whose last habitat was said to have been in the county. The birds were differenced from those supporting the previous Cambridgeshire arms by the placing of a red book beneath their feet. The book came from the arms of the University of Cambridge. The Latinmotto adopted also referred to the university, and was Sapientes Simus or "Let us be men of understanding".
Abolition
The county had only a brief existence: the Local Government Act 1972 reformed all administrative structures in England and Wales outside Greater London. On 1 April 1974, Cambridgeshire and Isle of Ely was merged with Huntingdon and Peterborough to form a new non-metropolitan county of Cambridgeshire, bringing into effect the amalgamation originally proposed in 1947.