Spotlight on Corruption has highlighted the importance of effective enforcement of Companies House’s new identity verification requirements under the Economic Crime and Corporate Transparency Act 2023 (ECCTA 2023) to help prevent the UK corporate registry being used by fraudsters, kleptocrats and other bad actors to conceal identities, launder money and hide illicit assets. It notes that Companies House issued 983,000 non-compliance letters between November 2025 and May 2026 to businesses whose directors and controlling shareholders failed to comply with the new requirements, with 183,000 persons with significant control recorded as in default. Spotlight on Corruption also observes that the regime remains in a transitional phase ahead of full enforcement powers becoming available in November 2026. It argues that warning letters alone may not be sufficient and that the success of the reforms will depend on consistent enforcement, the use of available sanctions where appropriate and the closure of remaining gaps in the verification framework ahead of the Financial Action Task Force (FATF) 2027 mutual evaluation.