#4
And thanks a lot once again Paul,
So this time sticking to Empididae wasn't futile.
OK maybe one day (soon) I'll dive into the (family level) keys... It's much better than pure guesswork

#5
Using Chv?la's 1975 key to Fennoscandian Empidoidea I get to
T. heeri. Leg markings are quite characteristic. 'Rather uncommon in northern Fennoscandia'. Further 'Scotland, NW of European USSR, mountains of central Europe, Siberia and Japan'.