You seem to think nuclear weapons stop all forms of tension short of nuclear war but the evidence is strong that even nuclear armed parties do things which don't include nuclear weapons. India applies strategic pressures to it's neighbours including ones with nuclear weapons. They're bashing each other with sticks and stones on the border, to avoid pulling nuclear triggers.

There was an ad-blue shortage in Australia last year, we have no onshore refinery and got close to running out. The nearest one is Indonesia and we were in a number of trade disputes regarding lumpy skin diseases and cattle and sheep. It only takes one or two sore points for something like "sorry, we sold your ad-blue to somebody else" and the entire mining sector is shut down.

British strategic military thinking assumed its role in NATO was unchanging. The re-appraisal post Ukraine has been significant and I am sure it includes waking up the arms manufacturing sector, and the input side to that is heavy metals industry, which has unfortunately fallen in a hole because of under-capitalisation and world pricing and Gupta and the like now "own" the national steel plan to some extent.

You would think that kind of thing would have been thought about. Just making trains onshore instead of buying them in from overseas would have possibly demanded continual metals manufacturing and processing capacity, which kept furnaces alight and steel making to the fore.