Showing 1955-1987 votes for the Southern half of the 705 consistent parliamentary constituencies (Appendix C) on the equal population cartogram - software by author on an Archimedes computer.
The major conurbation boundaries can just be made out in the graphics. In the animation, to which these are the key frames, the arrows can be seen swivelling around between elections like so many synchronised swimmers, in near unison. The consolidation at the end of the period, as groups of places begin to move in different directions, is particularly well marked. The blue arrows appear brightly on the screen, but are much less effective when printed.