Thousands of PIP claimants face repaying £90 million overpayment, with total benefit overpayments at £9.7 billion in the previous year, up from £8.3bn in 2023. Record-breaking high of 3.5m people receiving up to £737.20 monthly in PIP. Claimant errors cited as main cause of overpayment. DWP urges reporting changes in circumstances to avoid repayment.