Any further thoughts? Zooming in on the flower it seems to have 4 (?) stamens which would rule out H. riparia and H. calycina. Scaling off pics estimate leaf dimensions ~1mm wide x 10mm +- 3mm long. BTW according to LUCID H. riparia determined to occur only in Tasmania, southern Victoria, and SA - see https://apps.lucidcentral.org/plants_se_nsw/text/entities/hibbertia_riparia.htm.