[user104658]

The problem with what he suggests is population being condensed into small areas; i.e. if it was a straight "vote percentage" then London and the South of England (with a high density population) would be disproportionally represented in politics. The political requirements of different areas vary wildly and so, being blunt, some votes have to be "worth more" in terms of seats than others.

The only way it could work otherwise, is with massive devolution across the UK, devo-max for Scotland, and England being split into several "devo-max" areas with their own elected parliaments, with each area having representatives in London for "global affairs" with very little interference from the wider UK government when it comes to the day-to-day running of each region.

Otherwise you would have a few cities dominating the entire country simply because that's where "most people live". It's arguably the "purest" form of democracy but it's also completely unrepresentative of regional variation of needs and therefore, also broken.