The Government (BEIS) has issued a consultation document on the simplification of the regulatory regime for nuclear sites in the advanced stages of decommissioning. It proposes removing them from the scope of the Nuclear Installations Act, removing the role of the ONR and leaving the environmental agencies to regulate the final stages of site management.
This should reduce regulatory load and allow optimisation of the radiological clean-up.
https://www.gov.uk/government/publications/discussion-paper-on-the-regulation-of-nuclear-sites-in-the-final-stages-of-decommissioning-and-clean-up