Thanks for your reply.
Firstly, I am very sorry that you have found yourself in the difficult situation
If your mother does not have the requisite mental capacity to grant a power of attorney to you, in that she no longer understands the implications of the decisions put to her then you will be looking at making an application to the Court of Protection to be appointed deputy for you're her
If satisfied then the Court could effectively grant you the same powers in respect of his affairs as in under an LPA which your mother herself could apply for if she retained her mental capacity. In order to get appointed as quickly as possible I would suggest that you ask a local solicitor to prepare and submit the application for you. It will be more likely to be successful because the Court of Protection will take in to account the fact that your solicitor will have made his own judgement of the situation and come to the conclusion that there is no element of impropriety in the purpose of the application
You can find Uk solicitors through the following Law Society Website search engine:-
Enter either "wills and probate" or "trusts law" in the area of law box, they will have solicitors in those departments who can do this for you.
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