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Thank you for the responses, it's not a fortune, just the value of her flat which is soon to be sold.
We did the Power of Attorney in readiness for the time when she would not be able to take care of her finances. She sees her doctors who treat her problem and the solicitor was made aware of it too. She questioned her and was satisfied that EPA to me, was what she wanted. She reckons she will do the same thing with a new will. My sister holds the old one, I've never seen it. She has asked for certain things to be done with regard to her funeral and is relying on me to see to that, I suppose I need to be an executor to do that and I think my sister may have made herself that, as it has never seen the light of day. I guess I should go with her and speak to a solicitor, he can take all factors into account and hopefully give the correct advice. Some good points made by you all, thanks