hi Georgina63
I don't know how much you are dealing with (and don't tell us) - just keep in mind that an Attorney is only really required to consolidate any finances and spend them in the best financial interest of the donor, there's no specific 'duty' to actively work the funds to make a massive return (hardly likely in the current economic climate) - so as long as you keep the assets safe no-one will question your actions
I'm afraid I took the decision that dad always kept things simple, and as his income at the moment covers the care home fees (good on him for being so sensible about his pension arrangements), I have maxed his ISA contribution and just kept the rest in easy access accounts - for him, even a current 'high' interest rate will only add a couple of months worth of fees to the total!