To be fair to the gun-firers, the original mounting of the Aden cannon in the F6 was truly terrible. It was so flimsy that someone worked out that the gun must surely be moving around in an undesired way when it was fired, and they were right. IIRC some high-speed photography at Shoeburyness or somewhere confirmed it - the rounds were leaving the muzzle in a sizeable cone spray pattern.
So in the mid 1970s a mod came out to stiffen the gun mountings. The engineers didn't publicise it, they just got on with it when the kits were issued, but the results against the banner were suddenly so much better that the IWIs descended on the engineers demanding to know what we were doing differently. And making sure we didn't stop.
