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I have looked in many places to identify this fly. Apologies for the bad quality of photo, the fly was quite a distance away.

Many thanks
Christina

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Welcome to the forum Christina - this looks like Eriothrix rufomaculata, a tachinid parasitoid of Crambus moths :) It often helps if you add your Location ... advice would differ if you were in Australia, for instance ;)

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Thank you for the welcome and identification ChrisR. The location was Rye Mead, an RSPB nature reserve in Hertfordshire, which is near Hoddesdon. Hope this helps and I shall remember to put up the location when I post.

Thanks again

Christina:)