The manifest object of Pt23 is to minimise unnecessary discovery and
otherwise streamline the discovery process, rendering it more efficient and less
expensive. Thus, r2 permits a party to bypass discovery and proceed directly to
inspection of a limited number of specified relevant documents. R3 supplements
12 by providing for discovery and inspection of specific classes of documents, in
lieu of, or addition to, the inspection of documents provided for in r2. Other than
in exceptional circumstances, the previous law did not require a party obliged to
give general discovery to make reference to documents that were not, and had not
been, in his, or its possession or power, or to deny that documents were, or had
been, in his, her or its possession or power,? and, ordinarily at least, r3 will
likewise be concerned with specified classes of documents which the party
seeking discovery can demonstrate, by direct evidence or inference, probably
exist or existed. It is unnecessary to say more of that on this occasion, beyond
noting that the appellant acknowledged that there is nothing to indicate that
documents in all of the classes which are the subject of this appeal exist or
existed, although he submitted "that it... would be reasonable to infer..." the
existence of some such documents from the respondent's changed attitudes
leading to a decision that even partial disability had ceased.