Dark margin banding of the abdominal tergites seem minimal, less than what I'd associate with Chrysomya. The thin but distinct band of white pollinosity across the anterior prescutum also ends abruptly rather than fading out. If there are no objections, I'd like to confirm Lucilia sp.
I'm happy for you to confirm on this one, James. This is the first time I've seen the (field) differences between Chrysomya and Lucilia explained, I never could tell them apart!