Sorry T250
Having spent the last 26 years "holding over Bovingdon" for up to 40 minutes on bad days and never less than 10 mins in CAVOK I used to pray for another runway. I once took a note of all my holding in one year and it added up to 20 hours...............
....and that's not the entire story: after a 40 minute hold and finally landing, there is another wait to get onto the stand. The reason for this is that the previous aircraft cannot leave the stand.
The previous aircraft cannot leave the stand because the queue to take off is too long no more aircraft can join it. Once an aircraft is in the queue there's another 20-40 minute wait to takeoff.
Please can someone explain how is this making Heathrow "better not bigger" (to use the standard mantra of anti-LHR expansion MPs).