I think you may struggle to be honest. An overpayment can only be deemed 'official error' if the claimant did not materially contribute to the authorities mistake or ommission.
Even if it is accepted she was initially told it was disregarded as income (which is not beyond the realms of possibility), if the claimant did not declare the Carers Allowance on subsequent claim forms, I imagine the authority will argue she subsequently contributed to their error in not including it as income.
It was held in Saker v SOS for Social Security (1988) that in respect of the question of someone materially contributing to the overpayment, it must be shown that for the the relevant person to act differently might have prevented the overpayment
She may argue that she didn't include it because she thought it was disregarded as income, but if a claim form states 'Do you receive carers' allowance?', even if she thought it was disregarded, surely she would still answer in the affirmative? The fact that the claim form actually requested this information would suggest it may have some bearing on her benefit entitlement.
(However, If the application form doesn't actually ask about carers allowance specifically, but just states 'list your income', she may have a stronger case).
In CH2794/2004 a claimant initially declared a private pension and then subsequently failed to declare it on subsequent claim forms. The authority therefore ceased to include it as income. She argued that the resulting overpayment was official error as the authority should have looked at her previous claim forms. The Commissioner stated;
'I begin by assuming that the local authority’s omission to compare claim forms was a mistake for the purposes of regulation 99(3). Even on this assumption, the claimant’s omission of the pension from each of her claim forms was at least a contribution to that mistake'.
I would however ensure that the authority are only seeking to recover any overpaid benefit from the date they first have records of the claimant not declaring the ICA. I would also make sure they have taken into account the carer's premium in assessing the overpayment. If they have calculated the o/p manually (which is a possibility if they are going back almost 13 years), they may have missed this.
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