Many years ago a NW B747 enroute to TYO diverted to CYXJ
And an AF 777 diverted to Churchill (CYYQ) in 2002 - search for "air france churchill" - due to smoke. Churchill normally never sees anything with more than a couple of dozen seats and has no air stairs. They eventually got the pax off with a fork lift.
I once asked a BA 747 captain about diversions, after we had gone into Goose Bay with a medical issue (on this very same BA286, though it was a 747 then). He said "in a real emergency we can get a 747 into a 5000 foot runway, though we may not get it out again".
Back to the topic, I was wondering what has happened to the aircraft? Flightaware shows no movement CYVR-EGLL with a 380?