Pure basic economics. Not an indictmenht on “lazxy and feckless” Scots no matter what the Dail Heil would like to suggest.
Remember that it was government policy rigfht from the days of Thatcher (the Daily Mail’s favourite pin up girl) to Blair (Thatcher’s love child) to encourage long term unemployed people to move from Income Support / Unemployment Benefit to Incapacity Benefits.
This was cynically done to make he unemployment figures look lower than they really were.
If you break down the whole country and compare average income against recorded levels of disability obviously more disadvantaged areas will have more people on benefits. If they have been suffering from recession for a long time they are going to have more of those people on Disability Benefit - not because they are scroungers but because the Government put them there in the first place!
If you looked at other parts of the whole Country such as the North West of England where I come from originally and South Wales where I live now there are still lots of people who were “put on the sick” to make the Government of the day look better. Scotland (like Merseyside and South Wales etc etc) have had high unemployment for years so, of course, benefir rates are going to be higher.
Added to this, if you are disabled or generally in poor health, you are likely to have less income anyway so you are less likely to be living in “posh” area. If you look at areas that you know are “richer” than others you will see far less people with obvious health issues. When I lived in London, I always noted that you saw far fewer people using walking sticks, wheelchairs etc in Clapham than you would in Elephant and Castle and they were only a mile or so apart.