London hospitals have written off £112 million in unpaid treatment bills from overseas patients between 2018 and 2023, as NHS trusts balance care delivery with cost recovery. While non-urgent treatments are charged at 150% of NHS rates, many trusts face challenges in recouping these costs, leading to significant write-offs. Critics argue that the charging system is ineffective and deters vulnerable groups from seeking necessary healthcare. The government defends the system, emphasizing the need for overseas patients to contribute to their treatment costs.