Hi Holysmoke
PIP should stop after 28 consecutive days of someone being in hospital. If this applies to your friend's wife and this has not happened, the husband needs to ring and check, or he could find that they owe a massive overpayment. And if there has been an overpayment, the DWP will claw it back.
I know you've said he informed the DWP about his wife's admission, but he may not have told them that she is still there, and so her PIP has continued. This will probably seem scary, but he shouldn't leave it without knowing exactly where they stand.
BIS
Nothing on this board constitutes legal advice - always consult a professional about specific problems 
