The Government Says

Local government reorganisation: update letter to East Sussex and Brighton and Hove council leaders

Local government reorganisation: update letter to East Sussex and Brighton and Hove council leaders
Local copy of Update_letter_to_East_Sussex_and_Brighton_and_Hove_council_leaders.pdf

https://www.gov.uk/government/publications/local-government-reorganisation-update-letter-to-east-sussex-and-brighton-and-hove-council-leaders

seen at 15:12, 27 March in News and communications.