17 I want to return to, and make a comment about, the excursus. The excursus discussed what was described as a study by Mr Graeme Butler of Graeme Butler & Associates, who Senior Member Byard described as "a well known professional in the heritage field". In the course of his submissions before Senior Member Byard on 23 October 2003 Mr Camilleri questioned Mr Butler's report and for that he received a mild rebuke from the tribunal. I have now been presented with extracts of the report of Graeme Butler & Associates dated 2000 and it does seem to me that at least some of Mr Camilleri's criticisms may well be justified. In the report the Halls Farm Residential Precinct is identified[1]; and 24 dwellings in Elphin Street are described as non-contributory places[2]. One of these is number 13 Elphin Street, being the subject land. Yet in Appendix 14 to the same document, there is a list of places which are said to be individually significant to the city's localities, the city as a whole, the western region, the State or the nation and contributory places to assessed precincts. This list identifies No 13 Elphin Street as contributory, which is obviously inconsistent with the conclusion on page 115. Ironically this same inconsistency would also seem to be present in relation to the following properties in Elphin Street: 7, 18, 20, 23, 34, 36, 39, 41 and 47. Such an inconsistency might be thought to be surprising for a "well known professional" in the heritage field, but I suspect it too often characterises studies of this sort. It is important when a council considers whether to grant a permit pursuant to a heritage overlay for it to assess the proposal before it having regard to the primary evidence that is available and to be hesitant before automatically applying a heritage study. The study may have been done several years before and be outdated. The study may even have been done with a lack of professional skill. By their nature heritage studies will rarely consider every individual building in detail. Indeed sometimes they may be correctly described, to use Mr Camilleri's language, as drive-by studies. Further, and importantly, other factors may be important in assessing an application to demolish a building, such as the achievement of planning policies concerning urban consolidation. I fear that there may be a tendency for some councils to treat heritage studies, and policies which adopt them or which refer to them, as the equivalent of mandatory statutory provisions. This is a mistake.