The Government Says

The Principal Civil Service Pension Scheme (Amendment) Scheme 2026

The Principal Civil Service Pension Scheme (Amendment) Scheme 2026
Local copy of Principal_Civil_Service_Pension_Scheme__Amendment__Scheme_2026__signed_copy_.pdf

https://www.gov.uk/government/publications/the-principal-civil-service-pension-scheme-amendment-scheme-2026

seen at 16:31, 29 June in Policy papers and consultations.