Thanks again for comments past and future
A couple of people asked for the location :- Crash gate 6 which overlooks the southern taxiway and is usually quiet and also well away from main roads - obviously don't park in front of the gate or block the lane. It is 50/50 whether aircraft back-taxi up 24 or use the southern taxiway ( Charlie). I have noticed there is more likelihood of using the southern taxiway when there is more than two aircraft in the flight ( and or some aircraft are already up and may return imminently?)