@JonLewis Jon, My initial thought at the time was that this doesn't look like the typical meat ant, but I could be wrong. The nest also does not look typical but could be in early stages of development.
@AlisonMilton Hi Alison, I know what you mean, and had the same thoughts on many occasions early on. New nests and new workers sometimes stand out from what you are used to, especially the new workers which can look quite pinkish sometimes. So your first though is right - they don’t look typical, but are still Iridomyrmex purpureus. Cheers, Jon