What route is there to challenge the notification of excessive airspace? The new Canadian owners of Peel Airports and hence Donny Int'l are hardly likely to be aware of the issue. CAA DAP are reactive not generally proactive, unless a small grass aerodrome hands in its licence - then they pull any ATZ that was established.
So, unless someone knows better, I think we're stuck. Come to think of it, when was the last time CAS shrunk?
Sir George Cayley