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Well, I'm not saying Susan is wrong - it could be caesar :) but I think (from all I have heard and seen) that this genus is too tricky to give an "identification" from a few photos - it might be safer to say "it looks like caesar" or "it might be caesar" ;)

Also, it is quite dangerous to do an identification by starting with a list of species that you know are in your area because distributions are changing all the time and it might be a different species of Lucilia, previously unrecorded from that area. :D