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Thanks for trying, Paul! :)

Let's say about the size of an Empis (Pachymeria) sp. (which clearly is not) or an Empis (Leptempis) sp. (I have seen Empis abdominalis before, and was about its size). Somehow biggish. The pictures were taken with a compact camera and still allowed decent results. So, not precisely a small Empis ;)

It was feeding on a well developed typical Umbeliferae that might be Oenanthe crocata. Compare the size of the flowers and that should help to have an idea of the size of the fly too.

Good luck and thanks again! :)