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Caught in the East Sussex (UK) in early July this year. I caught 11 in total (in quick succession, at the same location) and the flies were ~12-15mm long

Sorry for the awful photos (the fly has been frozen, and is attracting condensation at it thaws - but I really /need/ to keep it frozen)

Is it possible to ID this to species from photos? What photos would be required in order to do so?

Is there a key (preferably on-line, or in an on-line publication) that I could use to key it out?

Thanks!

Darren