Occasionally they say no so sufficient fuel is needed for detours!
Lord don't I know that one, I had a hurried departure from Cherbourg with no internet connection to file a plan and ended up circling mid channel south of the military zone for 45 minutes in the pissing rain trying to figure out plan B because the zones were active and crossing them was refused. Ended up doing a huge detour back to the southwest skirting between the Islands and mil zones and reaching land near a place called Dunkswell for a unplanned landing in Swansea for the evening. A one hour crossing ended up a two and a half hour magical mystery tour! All ended well, the plane performed beautifully and the natives of SW Wales do enjoy a piss up.