Quote:
"To properly vouch for a lasting power of attorney, the certificate provider must be over 18 and either:
Someone who has known you well for at least two years — a friend, a colleague, neighbour, or even someone you used to work with.
Someone with the professional ability to check your mental capacity — like a doctor (e.g. your GP), registered social worker, or solicitor."
Source:
https://beyond.life/help-centre/admin-legal/who-can-be-an-lpa-certificate-provider/
[NB: See that link to read about who CAN'T be a certificate provider, so that you don't get things wrong].
So there are plenty of people who can perform the task for free (or perhaps, it's a helpful neighbour, say, in return for a bottle of wine). There's definitely no need to pay anyone.