I am sorry, I'm probably wrong about the model. SP44? I was trying to find out info about it. Hope the link works - turn the clock back to 16:49 UTC on 17th July and you can see it just above Kent.
FlightRadar24 strikes again.
As per Boeing_Eng's post, it was HZ-HM1B, a 747SP-68.
I have no idea where FlightRadar got the idea it could have been a 747SP-44 - of the 6 of that variant built, one is in a museum, 4 were scrapped and one written off.
Nice looking aeroplane, anyway:
