Your argument sounds like a good one to me. I've no experience of such HB cases, but I recall from my former AO days that no overpayment decisions could be made for periods when people were on Training for Work - when they used to get their IS rate plus ten quid. Those payments were not based on statutory entitlement but cobbled up administratively, and could not be treated as IS, so if an o/p period included a period of TFW in the middle, two seperate overpayment periods and decisions had to be given, omitting the TFW period completely. There was an administrative black-hole as far as recovery of such overpayments was concerned. This sounds like a very similar thing - with the black-hole eventually being closed by the SI, but no legal basis for recovery action prior to its commencement. My view, anyway... : )
jj
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