Jim I just checked through Trove 1917-1920 for the address, and you are correct: on 7 Aug 1918 there was a 'Mare, Waggon and harness, for quick sale, 18, (pounds) there (no name), and on 23 Oct 1919 for sale was 'Boot makers double headed hammer' (also no name). So I'm happy to accept that as circumstantial proof of a change of tenancy. The ALLAN family up until late 1917 were at 42 Johnson street Fitzroy.
Thanks again for your interest.