My OH has LPA for his MIL and is just starting to look at sorting out her finances. She is currently getting home visits funded by the council. She's got a few thousand pounds sitting in her current account and it seems sensible to open a savings account so she gets at least a little bit of interest on the money. He's got the LPA registered on her bank account and online banking - the easiest thing would seem to be to open a new savings account for her at the same bank through her online banking, but would there be any disadvantages he's not thought of? Would he need to register the LPA again for the savings account, or would it all be linked?