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Unwin's (1981) identification table to British families of Diptera was the work that got me started on identifying flies. It is freely available as a PDF from http://www.field-studies-council.org/fieldstudies/documents/vol5.3_143_A.pdf

The best family-level identification guide for Europe is, however, Oosterbroek's "The European Families of the Diptera: Identification, diagnosis, biology", see http://www.nhbs.com/the_european_families_of_the_diptera_tefno_150720.html

I hope this will help you