Repost from Money Matters as I'm hoping someone here as some experience of LPAs. I'm trying to help my parents set up a Lasting Power of Attorney for their financial affairs and all was going well doing it online, but we have one final hurdle to jump and I'm hoping someone can help. My father has mental capacity, but struggles physically and so we ticked the box that said he was unable to sign. My mum is signing on his behalf and her signature has been witnessed on Continuation Sheet 3. The problem is we don't know if that alone means that she is able to sign off the whole document, on behalf of my dad as the donor, before we send it off to be registered. Or does my dad have to make some kind of mark? Mum tried phoning the helpline today, but there was a 45 minute wait, so she emailed, but they said they can't respond within 25 days, which means we are over our 40 day limit to register the LPA. Can anyone advise us? Thanks.