I've been advised by my financial advisor that I ought to appoint a POA. I am in my forties, divorced, with 2 children (over 16 but under 25). I would like to appoint the elder, but joint with my father. I can't seem to see how to set this up, other than on gov.co.uk who charge a fee, or websites charging fees. Is it necessary to pay for this to be done or is there a form I can get from somewhere to fill out and keep in a safe place? Any advice appreciated, thank you.