Was the original power a straightforward PoA or and Enduring Power of Attorney? I am assuming (please correct me if wrong) that the donor of the power has now lost, or is losing capacity? If so, this has the effect of revoking the PoA. HOWEVER if it is an EPA, the attorney should apply for registration of the power and can then continue to act on the donor's behalf. Assuming the forms were correctly completed and executed, they will still be valid today. The MCA expressly preserves existing EPAs, but since 1 October you have been unable to make an EPA and have to make a Lasting Power of Attorney (LPA) instead.