[citation needed] Sections 26 and 27 and schedule M dealt with detached parts of counties.

[citation needed] Sections 35 to 37 and schedule O defined the boundaries of each parliamentary borough.

In ancient boroughs these replaced boundaries established by charter or prescription, often centuries out of date.

The commissioners favoured rational boundaries, encompassing an urban centre with some suburban room for growth.

However, some of the smaller boroughs to escape disfranchisement were given large rural tracts to increase the represented population.