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Once you have the family then (until you have built up a library) you have to ask around for key - as you are doing now ;)

Calliphoridae are a bit under-studied but Steven Falk made up his own key a while ago from other literature - a copy & paste job. If you like I can email it over to you ... not sure how comprehensive it is but it is a good start :)

EDIT: key emailed ;)