I’m based at Exeter. Very interesting decision..
While I am very much against grabs for CAS and have been scared to death with some close calls in the corridors that they create (M3 in particular) and also last week with a glider going directly across Gloucesters glide slope while I’m descending down it in IMC, I can understand why Exeter wanted the protection. Maybe a much smaller proposal to allow CAT to ascend to the overhead airway would have been more proportionate and potentially approved.
It is down to GA to do their bit - use your transponder, speak to the airport (Exeter’s ILS is clearly shown on the chart) and don’t blindly bimble across.. fairweather bimblers who don’t plan and cause airliner diverts will ruin things for all of us..