I found this particular bird in the Woodland where I walk frequently.
Unless you are really studying and on the look out for the Treecreeper, finding them is often pure luck. During this walk I spent about 30 minutes in one place overlooking what appeared favourable trees for this species, nothing showed.
However, I later moved on to another part of the woodland and there he was showing well in the sunshine. The bird moved from one low tree to another and fortunately remained at that level. Normally they will keep moving up tall trees searching for food as they go.
The first image here is one showing the Treecreeper in an upright position which is unusual to see.