Difficult for me too. Was this part of a longer song or just a short single call? When I first heard it, my gut feeling was "cut out phrase of Songtrush-song, especially with the short melody-tone at the beginning, easily missed here"
If this is indeed just a very short snatch of a longer song, Mistle Trush or Blackbird has to be considered, or a Blackbird, I agree with pianoman. But Song thrush is the best fit.
If this a single call, then my best guess is: if you dont know, what it is, its a ..... . Yes, than I think it might be a Great Tit imitating a finch call. They can do this very good, but many times you hear, that something is not right. And I get this feeling here, too.
Conclusion? Is this recording just a short snatch of a longer song?