An issue exists of whether it would be better to base constituencies on census population rather than registered electorate. Most countries seem to use population rather than registered electorate. Tweaking the system in that way would answer concern about under registration of qualified voters, particularly in large cities.

The changes in constituency distribution will reduce, although not eliminate, the pro-Labour bias which has existed in the electoral system in recent decades but it does not create an unfair pro-Conservate bias. Unfortunately it is not possible to eliminate the possibility of some systematic bias developing, without replacing single member constituencies and first past the post voting with multi member proportional vote elections.