Cut the number in half if you like, my point doesn't change.That's not how it works! The Trident D5s are loaded onto subs that go on patrol and unloaded from them when the subs need maintenance etc from a pool of missiles. The pool of missiles is shared between the UK and US who put their own warheads into the missiles. The missiles themselves need maintenance and have a shelf life in fact lockMart were given orders for additional missiles just last year!
The number of warheads is not simply a case of multiply by biggest number of everything! That's why doing one minute searches in wikipedia to generate "facts" is not the way to go!
Which is why it's absolutely wasteful and mental not to build the warheads and missiles to fill them out. It's like buying a Lambo but all it does is collect dust in the garage because you're too cheap to buy gas for it.The bunker, silo, missile defense and hardened tunnel network in China is absolutely massive, if not the largest in the world by far. All of that costs order of magnitudes more than the warheads to fill them out.