I think this is Polistes dominula, the European paper wasp
It's a bee. One of the Nomada species. Possibly Nomada fucata.
Well spotted, it's a Nomada bee. But not fucata, I think. From the photos you gave the link to fucata has a reddish segment at the top of the abdomen, absent in this specimen.
Nomada goodeniana looks more likely to me.
Could well be N. goodeniana, (...such a diifficult group!).
I suggested N. fucata not because I have any expertise in these species, but because once posted a photograph that was authoritively Id'ed as being that species, and from what I can tell it has all the same characteristic markings as your specimen. See: http://flic.kr/p/9ySky3