Approximately £100 million in premium bond prizes remain unclaimed, prompting calls for an overhaul of the tracing system. Critics argue the current methods are inadequate, leading to individuals missing out on winnings. Concerns center on the need for a more proactive and efficient approach to ensure prize winners are located and notified. Reform advocates suggest exploring enhanced data matching and communication strategies to minimize the number of unclaimed prizes and improve the overall fairness of the system. National Savings and Investments (NS&I), who run premium bonds, are yet to comment.