Three colours are mixed for the three major parties in each of 633 mainland parliamentary constituencies on an equal population cartogram — software by author on an Archimedes computer.
This image is based upon quartiles in a three colour circle, rather than the more appropriate electoral triangle that is used later, for comparison. The basic pattern is evident, however. See how closely this distribution resembles that of occupation (Plate LXXVII), but how London is a slightly lighter shade of pink than you might expect (a weaker Labour vote) while blue seats find it hard to break through further north. The constituencies are indexed for identification on the alphabetical list (Plate LVII) .