I operated with some of the Cabin Crew yesterday...
Gist of it was - Olympic failed to clear in time, Concorde went around from ~400'. Had come from BGI, so even shorter of fuel than usual (?). Mutterings about some further (minor?) problem meant they / ATC got it on the ground fairly quickly....
The Cabin Crew gave more details than I've given above, but am in no position to verify these, so will leave it at that!
NoD