I can't link as it's a PDF but if you google 'ONS Regional gross disposable household
income, UK: 1997 to 2016' it's the first result;
'Of the NUTS1 regions in 2016, London had the highest GDHI per head where, on average, each person
had £27,151 available to spend or save; the North East had the lowest at £15,595 and this compares with
a UK average of £19,432.'
'In terms of GDHI per head in 2016, all the top 10 NUTS3 local areas were in London or the South East
NUTS1 regions; the bottom 10 were more widespread but were confined to the North West, Yorkshire and
The Humber, East Midlands, West Midlands and Northern Ireland.'
I live in Liverpool and I'm from Sheffield which are both in the bottom 10 for disposable income growth so I suppose I probably have a slightly skewed view; I'm writing from experience and opinion, not stating facts.