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It is a female Lucilia, so can't be taken to species.
Could you explain a little please?
There are several species which can only reliably be separated on male genitalia. This is a female as the eyes are widely separated.
.. I see. I ran over them (in a book) last night, as you do.
It is a 'greenbottle' as David has said. I have seen a few here.
Lat/Lng: 54.8481, -2.0482
OS grid ref: NY970503