I wonder about other entries - what do you reckon:
MOD - Cash cow for WHL
the Merlin was designed to meet a contract issued by the user, it does that.
WRT being on time, on budget and maintenance to flying hour ratio - not by a long chalk and with the exception of T23, it's a pain in the @rse to take to sea. Granted, though, as an ASW mission system - first class!