Economies of scale and ships in ordinary

Research, weapons, and component costs become much more expensive per hull when planned classes are cut, as Type 45 and Zumwalt illustrate. Buying twelve missile sets instead of six also lowers production cost across launchers, ammunition, and the industrial supply chain. A larger fleet need not keep every ship commissioned: placing a planned share in ordinary creates a crewable reserve, permits orderly refits, and preserves surge capacity. Britain could rotate crews between active Type 23s or Type 45s and reserve ships while scheduling deep maintenance before defects become emergencies. Spare warships matter because even with an established design and production line, a replacement takes years rather than appearing when a crisis begins. The apparent saving from eliminating inactive assets returns as higher maintenance cost, lost availability, and strategic delay.