I can't see any arguement that IS are at fault or have any liability so the focus should be on the tax credit.
Was the employer paying SSP? If so, client would (or should) have been treated as being in work for WTC so that might shorten the length of the overpayment if not already taken into account. I take it that the phrase "employer unable to keep job open" means the client was dismissed. Perhaps there's an unfair dismissal and/or disability discrimination issue to be considered? If the employer was seeking to avoid paying SSP they might still be liable, in which case it's possible that WTC entitlement could continue (bit of a long shot...).
Client could also ask for discretionary non-recovery of WTC overpayment and be prepared to complain when the request is refused. The guidance on non-recovery states that difficult personal circumstances should be taken into account when assessing non-recovery.
GL
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