
An Lasting Power of Attorney(any other isn't worth having IMHO)can be completed online. Should cost around £150. I would always advise a joint & severally LPOA so that more than one person can act & in the event of one of the attorney's no longer being able to act the LPOA continuing. The attorney can be anyone suitable-relative, close friend etc doesn't have to be a solicitor. I always advise clients to have at least 2 people on a LPOA, All the information is on the Government website
If there is no LPOA & the person can no longer act(ie become mentally unable to act for themselves)than it does get expensive as you have to apply to the Court of Protection in order to act for someone else