Presumably that might also account for high numbers in places like the Rhondda?
It seems to be the case, Sky were reporting yesterday that Rhonnda has the worst Covid death rate in the UK, with part of that being attributed to the fallout from the mines
COVID-19: Living in the UK's deadliest place for coronavirus | UK News | Sky News
I can't speak for the places in England, but certainly can speak for the Rhondda as I grew up there and my parents still live there.
I certainly think the fact the area is an ex-mining area has a lot to do with it, but I am not so convinced it is just because of the health of people who used to be miners.
As the Sky News article suggests, the health of the general population of the area can be pretty low and we often come out pretty poorly when it comes to various measures of both health and deprivation.
And then you have decades of neglect to the area which has led to local hospital provision being downgraded and has led to the employment situation in the local area, amongst other issues.
In terms of hospitals - it has got so bad that people like my parents who don't drive have a 90 minute to 2 hour journey by two buses to get to the local major hospital now, whereas in the past when I was growing up it was a 15 minute bus ride (that one has been downgraded to just a minor hospital). I am sure some places in rural areas are just as bad or worse, but I'm not sure many places have had such a downgrade in recent years.
And in terms of employment - lot of the work is either manual work that cannot be done from home (and so workplaces have been open throughout all of this) or requires a commute to towns or cities slightly further away (and so requiring people to travel).
Then there's also the geography of the area to consider and how the towns and villages are intertwined. It is very common for someone for people to travel between the different towns and villages for various things - as an example if my mother was doing a weekly food shop, had a GP appointment and needed to go to the post office - that would involve a visit to 3 differently villages in the immediate area. And of course you have family and relatives who are often scattered amongst the nearby villages etc.
And one last thing that I have noticed more from friends who still live back there is I suspect a general distrust of government / authority which has led to a lot of people believing conspiracy theories or just ignoring government advice.
Basically - there are quite a lot of things that have probably come together to make the situation what it is.