Mrs X was not the clmt and, therefore, was not overpaid. In turn, there cannot be any underlying entitlement for Mrs X. Mr X’s o/p is a separate issue to Mrs X’s claim.
Even if Mrs X is a “prescribed person” and a potential target for recovery of Mr X’s o/p, the o/p is still that of Mr X.
Also, if Mr has left (as the reference to lone parent now indicates), he no longer occupies the property as his normal home and is therefore not entitled to HB (including underlying entitlement), irrespective of his financial circs. So, his o/p stands in any case.
If Mrs X is not a potential target for o/p recovery, it is only the backdate issue that has to be considered. If Mrs X is a legitimate target, any award of HB/CTB on her claim could be used to recover Mr X’s o/p – so long as the period of award & o/p are the same.
Hope this helps.