The Government Says

Local government reorganisation: update letter to West Sussex council leaders

Local government reorganisation: update letter to West Sussex council leaders
Local copy of SoS_-_Letter_to_Sussex_Leaders_25.03.26.pdf

https://www.gov.uk/government/publications/local-government-reorganisation-update-letter-to-west-sussex-council-leaders

seen at 15:24, 25 March in News and communications.