RJS,
Now of course the commonsense and logical cure to all of this is to declare the one frequency (123.45) as the worldwide air-air common frequency.
Commonsense and Logic are not the UK CAA's or most European Aviation Authority's strong suit by far. All we have to do is recall the advent/Demise of JAA and the coming of EASA to understand that mindset.
For those of you that doubt RJ's stats....when you discuss UK air traffic....do remove all of the foreign registered aircraft and their movements from the data would you....after all they are "foreign" aircraft.
How many airfields went for car parks and industrial sites over the past five years?