Not exactly different rules - just we ain't allowed to give the more protective service. Our prime task is (supposedly) inside CAS - and when it's busy you can't realistically provide a proper RAS if you're working another 10 elsewhere. And it's not fair to give ac a RAS but then not give them full attention, too many pop-ups (=bloody F3s again
)
I ain't actually advocating closing off the airspace and making it all CAS (as a flyer I actually think there's too much - particularly the HRA R610 - so much lovely countryside closed of to visitors from Europe
I'd just like a more responsible attitude to the other airspace users - not too much to ask - after all we pay for the fuel etc ....
PS P600 starts at Dublin (53.30N) as class C and goes through Glasgow as class D, becomes class A and routes over Aberdeen, becoming advisory route P600D (class F) to Klonn. Fascinating