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Thanks for your help, guys – I have since bought Oosterbroek's Guide to European Diptera Families (my bank balance is still recovering!) and downloaded a copy of Unwin's guide also, so I hope I am ready to start.

Paul, I live in Wolverhampton, in the UK, so I'm hoping that Unwin's guide will be useful to me anyway, but hopefully I now have Oosterbroek to fall back on.

I will keep you all informed how I am getting on - perhaps I will post a photo of a pinned fly and give you my identification, and see if anybody agrees with me? Or not, as the case may be! :)