I was outside having a cig and watched this plane on a strange flight path - Another plane was coming in on the normal path in and they must have been able to wave at each other...
When they come over us they are at just a few thousand feet so it was pretty clear what was happening.....
I looked at FlightRadar24 and it was a Singapore flight that had an aborted landing at Heathrow just before by the look of it -
I had a serious WTF moment
...