Trouble is there's no way a 2.5 nm radius class G ATZ goes anywhere near protecting IFR arrivals at places like Exeter, Farnborough, Humberside, Biggin Hill etc (doesn't even protect aircraft in the visual circuit) but do they need regulated airspace? A 'known traffic' block of airspace yes, but not necessarily regulated. Why not have a larger ATZ but still class G say 5nm radius?
Anyone from those airfields with IAPs in class G agree with me PM; maybe we could get together and put a 'case' to DAP for a larger ATZ.