Have to agree with "The Equivocator" here....we are not wall to wall housing,(yet) here in good old west London.....plenty of green open space and parkland available!!
As for single engined aircraft using the skies above us,well i dont mind one bit as there is more chance,(where i live),of a 747/777/A380 coming through your bedroom window in the early hours than a Hawk/Tucano etc,so from a personal point of view,"hats off" to the relevent OC ops involved for organising it all,(even if it's for a jolly!!),and long may it continue!!