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I did indeed think of Botanophila. They are difficult to identify for a non-specialist. I had one in 2012 on ragwort. I sent the larvae to Joke van Erkelens, who bred them. They turned out to be Botanophila seneciella.
I still have ragwort and I still see the larvae regularly. But of course that says nothing about this fly.
In Dutch on the Waarneming forum: https://forum.waa...c=196423.0
Here on my website http://www.tuin-t...engels.htm (Also with a Botanophila cf. fugax)

Thanks Eric and greetings Thijs