“ 23. Chinnappa Reddy, J. in S.L. Kapoor case laid down two exceptions (at SCC p. 395) namely, if upon admitted or indisputable facts only one conclusion was possible, then in such a case, the principle that breach of natural justice was in itself prejudice, would not apply. In other words if no other conclusion was possible on admitted or indisputable facts, it is not necessary to quash the order which was passed in violation of natural justice. Of course, this being an exception, great care must be taken in applying this exception. 24. The principle that in addition to breach of natural justice, prejudice must also be proved has been developed in several cases. In K.L. Tripathi v. State Bank of India5 Sabyasachi Mukharji, J. (as he then was) also laid down the principle that not mere violation of natural justice but de facto prejudice (other than non-issue of notice) had to be proved. It was observed, quoting Wade’s Administrative Law (5th Edn., pp. 472-75), as follows: (SCC p. 58, para 31) “ [I]t is not possible to lay down rigid rules as to when the principles of natural justice are to apply, nor as to their scope and extent. … There must also have been some real prejudice to the complainant; there is no such thing as a merely technical infringement of natural justice. The requirements of natural justice must depend on the facts and circumstances of the case, the nature of the inquiry, the rules under which the tribunal is acting, the subject-matter to be dealt with, and so forth.” Since then, this Court has consistently applied the principle of prejudice in several cases. The above ruling and various other rulings taking the same view have been exhaustively referred to in State Bank of Patiala v. S.K. Sharma6. In that case, the principle of “prejudice” has been further elaborated. The same principle has been reiterated again in Rajendra Singh v. State of M.P.7 25. The “useless formality” theory, it must be noted, is an exception. Apart from the class of cases of “admitted or indisputable facts leading only to one conclusion” referred to above, there has been considerable debate on the application of that theory in other cases. The divergent views expressed in regard to this theory have been elaborately considered by this Court in M.C. Mehta 1 referred to above. This Court surveyed the views expressed in various judgments in England by Lord Reid, Lord Wilberforce, Lord Woolf, Lord Bingham, Megarry, J. and Straughton, L.J. etc. in various cases and also views expressed by leading writers like Profs. Garner, Craig, de Smith, Wade, D.H. Clark etc. Some of them have said that orders passed in violation must always be quashed for otherwise the court will be prejudging the issue. Some others have said that there is no such absolute rule and prejudice must be shown. Yet, some others have applied via media rules. We do not think it necessary in this case to go deeper into these issues. In the ultimate analysis, it may depend