The moaning sound of the Sapphire could also be heard from the Victor 1's which of course had four of them. When the Javelin people discovered the centreline closure problem they failed to tell the Victor operators and a Victor out of Singapore suffered a double engine failure which was no fun in the grossly underpowered "in the hot" Victor. Because of the poor engine intake design the Sapphires were only producing 7500lbs thrust on take-off rather than the 11000lbs as advertised. I believe the captain got a gong for recovering that aircraft. Incidently I seem to remember the cure was carburundum paste on the blades rather than the casing but the effect was the same. There were certainly some incidents over France with Javelin engine failures caused by centreline closure.