MJF #26: Industrial pedigree of such kit is complex, sub-assemblies widely scattered. Paveway IV is "managed" by Raytheon UK/Harlow (nee Cossor); Brimstone by MBDA/Stevenage (nee DH Props).
"Cost" of kit is an irrelevance: if we (that is, our elected representatives) give a Task, it must be done bestest, quickest. Nigglers here are in fact disputing that the Task is "in my name": so their redress is to put up an alternative...which I presume would not be the "do nothing" option.