Regina v Visitors to the Inns of Court, [1993] 3 W.L.R. 287 [1994] Q.B. 1 [C of A]
The case concerned barristers who has been disbarred by their Inn.
Staughton LJ reviewed the history of disciplinary proceedings within the Inns of Court. He said [page 65]
From this history I draw the following conclusions. (1) The rules governing the profession of barrister are, with some possible exceptions, not part of the general law of England and Wales. They can be and are changed from time to time…
(2) …
(3) …
(4) The rules of conduct thus emerging form a private or domestic system of law for the purposes under consideration in these appeals .

Edited for ease of reading.