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First time on here so please forgive any errors in etiquette

This was photographed on April 26th basking on a common sorrel leaf in a nature reserve in Hertfordshire, England. It is in an open meadow near water. I can't find it any of my reference books. Its about 10-15mm long. As far as I am aware there are no cattle present.

Many thanks for any help!

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I guess you oversize this fly. May be 7-8mm?
It looks like female belonging to Anthomyiidae family.
Nikita

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Yep, probably oversized it. I see everything through a macro lens unfortunately. Many thanks for the pointer. Have ID'd this as an Onion Fly (Delia antiqua)