Hi Frajon
I am a Specialist Decision Maker for Pension Credit, I noticed that you mentioned that you have sent documents and had them returned? If that is the case then the date of reciept will be logged at the Pension Centre that you advised, and tho it can sometimes take a while for the paperwork to reach its team, and then be processed in date order, you (your friend) will only be liable for any overpayment that occurs before the date of notification.
It may be that your friend will retain entitlement to Pension Credit but at a reduced rate as the regulations regarding capital do not have an upper limit, but deduct monies from Pension Credit on a sliding scale based on the amount of capital held. Dont worrty about the £47.10 disability benefit, it is either Disability Living Allowance or Attendance Allowance, and as a fully self funding resident in permanent care your friend retains entitlement.
I am happy to advise further so have subscribed to the thread.. just give me a shout
best wishes
Steve