Incidentally, why is it so important we have access to JSF technology but not to Trident?
Read the
Defence Industrial Strategy
Basically, we want to retain the ability, where we have it, to mainain, update and operate our own assets. With JSF that means doing software updates and adding weapons and sensors of out own. We have no equivalent expertise in ICBMs, and it is unlikely to need any update other than that provided by the USA.