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Many thanks John for your answer.
I have had a look at images of Delia sp and I agree that "my specimen" looks like a Delia sp. I attach two new (not very good) images of the hind tibia from two different angels. There are many short "hairs", but I don't think a supposed row of posteroventrals is visible?. (I compared with images of Delia platura, the most common Delia species here in Sweden)
There are more than 50 different Delia species here in Sweden so I don't believe we can get to the actual species - but perhaps agree that this is a Delia sp.?