<<Early vectoring off departure routes to enable increased runway capacity during recovery from disruption>>
We could do that 30 years ago but presumably it's forbidden now?
Members of the public complaining about off-track departures are told:
"There may be occasions when Air Traffic Control (ATC) direct aircraft off an NPR at an altitude below 4,000ft. This may be necessary in order to maintain safe separation from other aircraft or for other safety issues such as weather avoidance."
No mention about doing it simply to increase runway capacity.