The Act responded to the problems caused by the fact that an increasing number of municipal boroughs were gaining county borough status as soon as they reached the requisite 50,000 population. This was leading to loss of territory by administrative counties. The consequent loss of population and rate base affected the finance of county councils.
On 16 February 1923, a royal commission had been appointed under the chairmanship of the Earl of Onslow to "inquire into the existing law and procedure relating to the extensions of county Boroughs and the creation of new County Boroughs in England and Wales, and the effect such extensions or creations on the administration of the Councils of Counties and of non-County Boroughs, Urban Districts and Rural Districts; to investigate the relations between these several local authorities; and generally to make recommendations as to their constitution, areas and functions".[1]
The commission published its first report in 1925, and among their recommendations were that:
All proposals to constitute a county borough should be made by private bill, and not by provisional order under the 1888 Act.
Extensions to county boroughs should be by provisional order where there were no objections, and by private bill where objections were made.
The population requirement for the creation of a county borough should be raised to 75,000 from 50,000.
In dealing with applications for extensions to existing county boroughs, the wishes of the inhabitants of the added areas should be taken into account, except where there were "weightier considerations of public advantage".[2]
The 1926 Act implemented most of the commission's recommendations by making the following changes:
The Minister of Health lost the power to constitute county boroughs by provisional order.
The corporation of a borough could not promote a bill constituting the borough into a county borough unless the population according to the last census was 75,000 or above.
County boroughs could not apply to the Minister for a provisional order extending the borough boundaries unless they had first sent a draft of their proposals to all the councils of the administrative counties, boroughs, rural and urban districts affected. The councils had four weeks to object.
The Minister could refuse to extend the boundaries due to objections by the affected councils, or for any other reason.
Where a provisional order to extend the municipal boundaries was refused by the Minister, the county borough corporation could promote a bill, having first informed all objectors of their intention.
The last county borough constituted under the 1888 Act was Doncaster, with a population of about 60,000, in 1927. Another county borough was not created until 1964.