Seven frames taken from an animation showing just over half of the 633 mainland parliamentary constituencies, coloured by the mix of voting in 1987, being transformed from an equal land area to equal population projection — software by author and Ace computing.
Here the distorting impression given by the original map is made clear. See how that, as the true picture is revealed, the red, blue and green polarization becomes apparent. The division of the southern half of the country into green and blue areas — around red and purple places — is made clear. A bright slice of yellow still remains to remind us of the now squashed Celtic fringe.