So we have 40x more landmass but 30x more flight hours. So 1.33x more landmass per flight hour. But we also have 4x less accidents per hour flown.
If we had 1.33x less landmass will we have the same if not greater number of accidents per hour flown as the UK? A 4x increase?! I very much doubt it!
Constant holding is an effect of runway availability and poor speed management. Once these problems are solved then holding should reduce and allow for continous climbs and descends.
But this is not GA's problem - In fact I should say that if there are no airplanes inside some airspace, then there is no reason to refuse others a VFR clearance: We don't have any Class A airspace below 18,000ft.
I've still seen no sign of your ACP.
Don't worry! I am in touch with various people who are submitting them on the behalf of UK's 'clockwork mice'. I was kinda expecting you to throw them out the window anyway so why should you care?