If there is one massive regret my family has, it's not having got PoA for our mother, who now has advanced Parkinson's. It cannot be got retrospectively, that is to say, once someone is deemed to have lost mental capacity. Yeah, I don't know, maybe some obliging GP may be able to wave it through on the quiet and look the other way, but I have never known that happen.
Failure to get PoA in Health and Welfare, and once they lose mental capacity, the State assumes legal control of your mum/dad. You, as next of kin, have no legal power whatsoever. When I say 'state' I mean some of the grubbiest folk who work in your local Council's adult social care, Safeguarding heads who turn a blind eye to care home abuse, that sort of thing. They can intervene to stop you moving your relative to another care home, and get up to all sorts of tricks, just to toy with you and gang up with the care home against you. If you have never experienced this hitherto, well, that's how they want it. Wait til you need PoA and don't have it, then they show their hand.
I mean, seriously, no one mentioned PoA before we needed it, and after that, v often it's the first thing anyone mentions. It's like 'Can we turn you over or not?' Be it our local MP when discussing care home issues, hospital care, care homes, the whole lot. Don't have it, and you won't even be allowed to look at your relative's medical notes, though some nurse who met her only two days ago can.
It is hard work all this, and care homes don't have to do anything. To have all the responsibility and no power is a recipe for massive stress. Take it from me.