That's good to know JaneJudge. I will suggest the carers assessment but I am now sure how it will be welcomed - a very busy person with a very busy job and not inclined (in the nicest way possible) to expect anything for themself.
Greenlady I think they hold both POA's, certainly the finance one. The carer has already started putting reminder notes up for the parent so is beginning to make a list and checking what they can and will do and what they can't or won't.
Thank you all for helping. You probably all know what a difference it makes just to talk and issue over with kind people prepared to share their knowledge but it's worth saying again what help it is.
I think the overseas sibling is struggling with not being able to come in an emergency. Not coming to see family and friends is bad enough, of course, but I will say they are doing all they can and phone calls and video calls of normal family stuff is probable all - but a very important 'all' - they can do at the moment.
to all you kind posters
To think that London, or anywhere else for that matter, does not belong to any one demographic