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This is going to be very tricky to identify because I don't think we have anyone on the forum who is experienced with Australasian tachinids ... especially the tiny little black+grey ones ;) That said, in Europe I would guess from the size & colour that it would be a Siphoniine, like an Actia sp. but on yours the frons looks way too wide for that group. Perhaps Theo can suggest something though :)

Would help if you could get some shots of it from other angles - a few lateral and dorsal would be good :)