Lib Dem strength at 2017 GE (the borders were distinguishable in Inkscape, so I didn't think black fills would be too problematic; it doesn't really concern me still because the entire exercise was to show where they weren't a write-off):-
(click to enlarge).
Turn border lines into white and problem solved. White lines are more distinguishable with dark colours, albeit problematic when using light colours as canary yellow. I have the impression that we've been using the same base map. Could it be?
https://saintbrendansisland.files.wordpress.com/2017/06/uk20172.png
