Thanks for your replies , sorry to be late to see it, was too busy flying holiday charters
I saw those EGU zones on the free SkyVector.com VFR chart , e.g. south and SW of Manston you have ' EGU-WALDERSHA' 'EGU-HARRINGE' and also 'EGU-BONNINGTON' , .. EGERTON, ..LINTON '
http://skyvector.com/
Not an official denomination ? or covering ultralight or small glider fields ?