To be honest (and this is from an Engineer's point of view) have always found the GR4 to be a loveable rogue, whoever designed certained aspects quite clearly thought about the maintenance aspects, easy access panels, quick rectification though LRUs etc. However the ECS system for example is an utter dog's dinner
and less said about the engines the better (disabled by a Navigator's map........typically on a Friday afternoon
).
Still, excluding BAe's attempt to charge the earth for every nut and bolt
not a bad wee thing.
ps. Harriers were better.