Repayment of benefit improperly received

(1) Without prejudice to other provisions in this Act, if it is found that any person by reason of the non-disclosure or of misrepresentation by him of a material fact, whether the non- disclosure or misrepresentation was or was not fraudulent, has received any sum by way of benefit while he was not entitled to that benefit, he is liable to repay the sum so received by him. (2) Where any person is liable to repay any sum received by him by way of benefit, that sum may be recovered, without prejudice to any other remedy, by means of deduction from any benefit to which he thereafter becomes entitled. (3) Without prejudice to any other provision of this Act, if the Board by reason of an error made in good faith has paid to an insured person by way of benefit any amount exceeding the amount due at a particular time, the excess payment may be set off against any benefit which falls due to that person within six years after the date of the overpayment.