BA273 LHR Return
 

I just seen a BA 747 flying low over Islington, I been here all day and this is the first ac at I'd seen overhead. I checked Flight radar and it was G-CVIC operating BA 273 to Las Vegas, I know these things aren't always accurate but according to Flight Radar it only got at far as High Wycombe before turning back.
Obviously it must have been something relativly serous for it to return without dumping fuel.
Does anyone here know the reason for the return?

It was BA275, not BA273 (G-CIVC, not G-CVIC).

Airborne for around 2 hours, so it's likely that it did actually dump fuel.

Thanks for the info.

Medical emergency, according to sources.