In R (Harvey) v Ledbury Town Council [2018] EWHC 1151 (Admin), Mrs Justice Cockerill held that the defendant council lacked the power formally to investigate, determine or impose sanctions in relation to a misconduct allegation under its grievance procedure. The Council would have been able informally to investigate the matter, but no more. Accordingly, action taken in response to the allegation (including preventing the councillor’s contact with particular staff) was ultra vires.
https://www.11kbw.com/knowledge-events/case/key-case-on-councillor-codes/
https://www.11kbw.com/content/uploads/Harvey-Ledbury-final-TC-21052018.pdf