Why did the Operator hang up after Agent Tucker said "18 Inches"?
In Johnny English Reborn, after Agent Tucket says to the operator that the altitude of the helicopter is 18 inches, why did she hang up on him?
Presumably because the operator thought it was a prank emergency call.
A helicopter at 18 inches of altitude is very close to the ground and thats a very unusual emergency.
Obviously, (out of universe) it's intended as a joke and to give us the driving a helicopter like a car scene.