I've had 2 GAs in the last year at Heathrow.
1st. 27L An A330 a bit slow vacating, the controller told us to Go Around at 200 ft. although we could see the 330 turning off, and felt we could have landed after as it was daylight VMC.
However GA performed.
2nd. 09L An Uzbeck A320 (I think) landed ahead of us and rolled 3/4 of the way down the runway before vacating despite several calls from the tower to expidite. We went around from about 50 ft.
Each GA cost about 1 ton of fuel, so occasional reminders about minimum occupancy time should be of use.
Type A300-B4.