See David's 2023 summary of Level 4 2023 changes, see complete revised Blue Book.
Some changes in the EBU announcing/alerting September 2022. David drew up a summary of the 2022 changes for directors.
Official English Bridge Union Site
Mr Bridge retired in December 2020 but see his successor's site https://bernardmageebridge.com/ who is carrying on the good work Mr Bridge was a useful bridge site with a library of systems and conventions and a regular newsletter. The site of an (free) independent Bridge Magazine.