Not sure what they were but we had four military jets fly over Finchley this evening when I was waiting for the bus home (about 8pm). Having just seen a video clip on the BBC from the Franborough airshow the planes did look like the new F22 Raptors. But then again I have absolutely zero knowledge of military jets (or any type of plane) so it could have been pretty much anything (not Stealth Fighters though as they're distinctive enough that even I recognise them!).
Anyway, it was an odd sight to see them flyover and then have the noise of their passing hit and linger :p