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Hi Sarah,

There is a great new key to the European Diptera families, which is very well illustrated. Unfortunately this key is in Dutch! However, preparations are being made already to translate this key in English. I don't know when this key will be published.
So for the moment you could use the key to families in Volume 1 of "Contributions to a Manual of Palaearctic Diptera" (Papp & Darvas eds; 2000). Unfortunately the volumes of this Manual are very expensive.

I hope there are others who can give you the title of another key which is both currently available and not extremely expensive.

Jan Willem