[j4_james]

Actually I think it's only 56K in pounds - 73K is the dollar value. It's confusing because the order of those values is swapped between the two maps. On the first map they have $73K (£56K), i.e. the dollar value is first. On the second map (adjusted for cost of living) they have £84K ($104K), i.e. the pound value is first.