"The rules which govern the conduct of members of a body of
professional men, such as the Bar of New South Wales, may (though
there is, of course, no logical dichotomy) be divided roughly into
two classes. In the one class stand those rules which are mainly
conventional in character. To say this is not to deny their
importance from the point of view of the client. But they are
designed primarily to regulate the conduct of members of the
profession in their relations with one another. Many of these rules
are reduced to writing, and they are from time to time interpreted,
and perhaps modified to fit specific cases, by resolutions of the
governing body of the profession. Examples of this class in the
case of the Bar are the rule which forbids advertising, the rules
with regard to retainers, the rule that one of Her Majesty's counsel
must not appear without a junior. A breach of any of these rules is
treated seriously, but would not warrant disbarment-at least unless
it were shown to be part of a deliberate and persistent system of
conduct.
Rules of the other class are not merely conventional in character.
They are fundamental. They are, for the most part, not to be found
in writing. It is not necessary that they should be reduced to
writing, because they rest essentially on nothing more and nothing
less than a generally accepted standard of common decency and common
fairness. To the bar in general it is more a matter of 'does not'
than of 'must not'."