I once flew a Cessna 525 CJ2 into Heathrow, about 10 years ago.
It was a transplant flight around 3am.
The airfield was closed to commercial traffic but they open up for us.
I have to admit it was awesome and probably one of the best things I did in Aviation.
Taxiing took forever but was massively efficient.
We heard some chuntering on approach from aircraft in the hold waiting for the airfield to open as we skipped in below them.
Being me by the Ambulance and Police was quite emotional.