25 It follows that where the real and substantial purpose of land use is that of an institution such as a school or hospital, such purpose may encompass individual ancillary components of land use such as a café or industrial use, which would otherwise either be prohibited or require separate permission. Thus historically it may be the case that the plant propagation use at the depot constituted agriculture but was an ancillary element of the water authority's depot.
26 The application of cl.64 presupposes that a subsidiary land use can be identified and ascertained to operate upon land, but nevertheless the purpose of such use is properly understood as subsumed in a larger purpose for which the land is otherwise used.
27 Clause 64 necessarily contemplates that a use otherwise identified in the planning scheme may be an ancillary use, albeit that if it is ancillary it need not itself comply with the scheme.
28 It is always possible that land will be used for two or more purposes, each of which is independent and none of which can be regarded as ancillary to the other.[11]
29 Clause 57 does not require the application of the concept of ancillary use. It simply requires the ascertainment of separate uses upon the land which are undertaken in conjunction with each other. Such uses may or may not involve an ancillary use. The requirement for a functional nexus between the uses raises the real possibility that one or other use may be ancillary to another use but this question is not determinative of their lawfulness. What is required is separate identifiable uses carried on in conjunction with each other.
30 The New South Wales Land and Environment Court has had occasion to consider a series of planning controls utilising the phrase "in conjunction with", including provisions pursuant to which shops were permissible only if "ancillary to or used in conjunction with other development permissible in this zone which serve the daily convenience needs of the workforce within this zone."[12]
31 In Winten Property Group v Campbelltown City Council[13] the Court considered a requirement that "dwelling houses (be) used in conjunction with development for other permissible purposes." Sheahan J considered the earlier authorities and accepted the following submission concerning the proposal before him for dwelling houses to be constructed and used together with a club house and recreational facilities (which were permissible uses):