I'm in Sydney, and you can access most of these records (free) for yourself, except most censuses (subscribe to Ancestry or one of the other online sites for those). You can see the IGI and the 1881 census through FamilySearch.org.
See IOM burial, wills, census, and other indexes at: www.iomfhs.im/default.aspx?CategoryID=22

There is an early Stephen Camaish of Andreas will (1757) transcribed in the wills index:
www.iomfhs.im/lawsons/twill/1757_022.html

Sue