The whole LPA in Health and Welfare thing, I can only say, if there is only one thing you do, do that.
Don't make a big deal of it. It's like travel insurance when you go on holiday. Just do it. If you have it and you don't need it, fine. If you need it and you don't have it, you are totally stuffed. From then on, the local Council ie Social Services are legally in control of your father's care and they are cut-throats and wholly unaccountable. They are basically corrupt.
In any power struggle between the so-called State and your father, the first put-you-in-your-place question will be: 'Do you have Lasting Power of Attorney?' If not, you are stuffed. They can do as they please. Sure, they have to 'consult' with the family acc to some Care Act, but in practice they know how to run rings around that.
You will not even be allowed to see his medical notes. Not until he had died, and even then various concerns try it on, saying you're not entitled to it, if there's a cover up to be maintained.
It cannot be got in retrospect, whereas the LPA in Finance can, though it's still better to get it beforehand.
Other stuff, the 'painful' decisions have nowt to do with LPA. I mean, just get it, fill out the form, you can add to it later and go into more detail I think. I'm not sure he has to detail end of life care, I mean spouses get LPA for each other in case of an unexpected accident is not all about dying and that time of life.