As Shalli said, the burden on the wage earners is more for these family units and I'm afraid I don't have the insider knowledge to comment on who wipes whose elderly bum...
Rather disingenuous cutteduppear. Like you, I work with refugees and like you, I've not taken an arse wiping survey amongst my clients, but I know enough about the client group I work with and indeed the societies sending the greatest number of refugees and asylum seekers to the UK to know who tends to be doing the unpaid care work.
but it's interesting that the UK model of care of the elderly is not widely adopted across the world.
Depends on your definition of 'interesting', but it's been pretty conclusively explained why the Afghan model can 'work' there (well, if we can say it works when Afghanistan is such an awful country to be elderly) and wouldn't here. The UK model is actually pretty expensive, and most countries in the world are poorer than us as well as having fewer elderly people as compared to younger. I mean, do you really think Afghanistan as a society could emulate our care model even if the Afghans themselves wanted to?
Fundamentally, you were presenting the Afghan model of care as something positive, in that you said it was something we could do with learning from. But it's not, and it isn't, because it only exists due to a number of factors we should absolutely not look to replicate: many fewer elderly due to shorter life expectancies, very high birth rates and childrearing very young, and limiting the opportunities available to women.