I would assume a majority of this affects England London more than the other regions.
Fixed that for you. The difference between London and everywhere else is so vast that the people in, say, the north of England would benefit from abolishing inheritance tax no more than people in Scotland or Wales. I'd be interested to know how many people in the south west are affected though, since we have the second highest house prices after London, and a higher percentage of second homes house-hoarding amongst the wealthy compared to the rest of the country. So I'd love to see a devolved breakdown not just by nation, but by region or county.