I find that 'descend now' doesn't use nearly as much R/T time as responding to the query "Is that descend now, or pilot's discretion, London?"
One thing I've noticed, though. Why do some crews request descent, then not leave the level for several minutes? Seems to be a charter airline peculiarity.
Also, in the recent months of excessive delays, level restrictions, etc etc, I've found flight crews to be tolerant, friendly and uncomplaining.
So to pilots using UK airspace these days, thanks.
