Definitely get LPA's sooner rather than later.
Just 3 and a half years ago, my parents were fit and well and needed no care. Mum died, and it became apparent that Dad knew nothing about anything.
He wanted to be moved into a retirement village, which me and sibling did for him. He had no clue how to sell the family home, or how to purchase his new place. We did it all, including emptying his house, of 40 years of possessions. It was a truly horrendous time.
His health has declined rapidly, and he is now immobile with carer visits 4 times a day. Healthcare professionals are starting to suggest a nursing home might be on the cards. Neither me nor sibling could take him in - he's 22 stone with a myriad of needs that only a professional could deal with. I would never have believed this, if you'd told me 4 years ago, that this is where we'd be at.
On the plus side, we do have LPA's, and we have used them a few times. For eg. I have control over his bank account (he would not have a clue how to do it). And any time we need to do the smallest thing for him (like change his Sky package) they always ask for LPA, so it's an absolute must. Be aware, they take AGES to go through, so it would be a disaster waiting until you needed one.