“ 13 . The matter may be examined from another view point. There may be cases where there are infractions of statutory provisions, rules and regulations. Can it be said that every such infraction would make the consequent action void and/or invalid? The statute may contain certain substantive provisions, e.g., who is the competent authority to impose a particular punishment on a particular employee. Such provision must be strictly complied with as in these cases the theory of substantial compliance may not be available. For example, where a rule specifically provides that the delinquent ofÏcer shall be given an opportunity to produce evidence in support of his case after the close of the evidence of the other side and if no such opportunity is given, it would not be possible to say that the inquiry was not vitiated. But in respect of many procedural provisions, it would be possible to apply the theory of substantial compliance or the test of prejudice, as the case may be. Even amongst procedural provisions, there may be some provisions of a fundamental nature which have to be complied with and in whose case the theory of substantial compliance may not be available, but the question of prejudice may be material. In respect of procedural provisions other than of a fundamental nature, the theory of substantial compliance would be available and in such cases objections on this score have to be judged on the touchstone of prejudice. The test would be, whether the delinquent ofÏcer had or did not have a fair hearing. In the case of Russel vs. Duke of Norfolk & Ors., 1949 (1) All E.R. 109, it was laid down by the Court of Appeal that the principle of natural justice cannot be reduced to any hard and fast formulae and the same cannot be put in a straitjacket as its applicability depends upon the context and the facts and circumstances of each case.”