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Thanks Theo.
So after all a Blepharipa pratensis!!. Usually I recognize them. I see them every year in the part of the garden with, among other things, berry bushes under a big birch (I have a small greenhouse there, where I check every day whether any nice insects have flown in. That's where I found this fly). Every now and then I send a photo to Observation. But usually leave them alone. Here is this fly https://waarnemin...278265876/
I took a look at all my flies. All have been males so far indeed except for my first Blepharipa pratensis in 2009.
That was this one (easier to recognize for me) : https://waarnemin.../43003321/ I assume you said that it's a female? . I don't remember.

Regards, Thijs