The purpose of the official error regs was to allow extended arrears to be awarded when the cause of the overpayment was an official error, so we are talking about underpayments. It may be useful as a kind of "set off" device to mitigate against the amount of an overpayment. It is however very clear that the IR never intended it to be used a s a backdoor way of challenging recoverability.
Having said that, COP 26 says offical mistakes that are coupled to a lack of claimant knowledge, may be a way of persuading the IR not to recover. Presumably, any case law that flows from fights over reg 21, may help set or suggest the context for deciding recoverability, at least in part.
Unfortunately, many overpayments are not down to official error, as described in reg 21.
Steve
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