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I am searching for a comprehensive guide with colour pictures to Diptera found in Great Britain - any suggestions anyone?

I have the Collins Field Guide to Insects but need something more comprenensive.

The reason for this request is that I am a serious Natural History Photographer and when I enter an International Photo Exhibition with one of my insects it is very important to give it its correct Latin Name and Common Name if there is one.

Example, I note from the Collins book that there are over 50 species of Dung Fly native to the UK but only one is shown.

Help please

Tremaine