6. Where an extended payment (severe disablement allowance and incapacity benefit) has been allowed and the person to whom it was made has also claimed council tax benefit for a period that includes any part of the period specified in regulation 61(6)(a), the entitlement to council tax benefit, if any, of that claimant, in respect of each or any of those weeks, shall be reduced by the amount that that extended payment (severe disablement allowance and incapacity benefit) has discharged his council tax liability, in respect of any such week.