Oh no...

not another hoverfly blip?!

Fraid so. Actually i had better shots than this but I'm including this one because youngest Murmuration made an interesting comment about its pattern which he said looked like a couple of boxer's squaring up with their fists out. And he's right!

Research on the internet (am I really reduced to this?) indicates that it is Scaeva Pyrastri. So now you know.