Polremy
It doesn’t have to be expensive. You can do it yourself. It looks scary but it really isn’t.
I sent ours off but had made a couple or errors.
A very nice man from HMRC ( ?)helped me sort it.
I think it cost us around £80 each.
We have friends who paid over £1000 to a solicitor.
We did our own too. We found it perfectly straightforward, but you do need to read the instructions very carefully, particularly as regards signing and dating. Any mistake means that it will be rejected, and you’ll have to start (and pay!) again.
It’s worth mentioning that in the Health and Welfare P of A you can add a paragraph to state your wishes in e.g. the case of your losing mental capacity, or because of e,g, a stroke, being unable to make your own wishes known.
Ours made our wishes very clear as regards any ‘striving to keep alive’ in the case of dementia or any other condition where we might be unable both to care for ourselves, and speak, with full mental capacity, for ourselves.