I think it might be Campion sp., but I have never attempted an ID on a mantis fly before. ID assistance would be greatly appreciated. Three photos uploaded including face and top down view. Campion tenuistrigus ID by Ken Harris via BowerBird.
Scarlet Honeyeaters have irrupted into Victoria this spring, and have been recorded in many places that they have never been seen in before. It was great to find two at my local patch, which is probably not the right habitat for these at all. Wikipedia has an interesting article on irruption https://en.m.wikipedia.org/wiki/Irruptive_growth