London is more than twice the total for Scotland and Wales together; but, London has a larger population than Scotland and Wales put together. South West England, which probably doesn't, also has a larger IHT contribution. Those figures would be more interesting if normalised by population.
However, I don't believe this captures the full stratification of wealth in the UK. The fifty richest families are said to hold more wealth than 50% of the population.
https://www.theguardian.com/news/2025/may/19/uk-50-richest-families-hold-more-wealth-than-50-of-population-analysis-finds
