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And now she'll also be nagging you about the money you might end up spending on keys to species in various families! For Calliphoridae there is a useful, although not entirely comprehensive, key to UK Calliphoridae:
http://www.amazon...0855463031 . Fortunately this one is not too expensive.

If you want to start on other UK families I would thoroughly recommend joining the Dipterists Forum. For a paltry £6 you get a handbook, access to manuscript keys to some families, workshops to families - usually held near Shrewsbury and a twice yearly newsletter. Also, there is a brilliant newtwork of Dipterists you can meet at field events and workshops AGM etc. http://www.dipter...c.php?id=3