Mad Jock
I had a friend who flew G J+T? for years on a PPL IR and SP too! He was/is an excellent pilot.
Whether the ruling has changed? His was a Citation two.
As for his £4000 costs? media rubbish as usual.
Even at 20 hrs round trip at a minimum of £1500 per hour you are looking at £30000 for the aircraft or £20000 done at bare cost.
Maybe they missed a 0 off the cost and it was £40000 which with crew and other costs would be nearer the mark for such a round trip!
Pace