I don't have a chart in front of me, nor am I familiar with Tamworth these days, but did your climb take you out of the TW CTR and into their CTA? If so, they require a departure report. If you remain below the D CTA steps no report is required.
Caught us out a few times early on at another aerodrome when the June 3 changes were implemented. It was good of CASA to highlight this requirement during their roadshows
.
Doesn't really affect the former GAAPs as their surrounding airspace is usually different (in my neck of the woods anyway).