The naval situation is even worse, because the UK totally depends on the USA now for its own nuclear arsenal. The UK has basically stopped being independent. Changing this will be hard and I don't think anyone in the UK wants to do that. There is no way for the UK to compete against South Korea's production; Canada will buy more equipment from South Korea. UK has never been in the race for competition (only Germany has). The UK kind of went into decline ever since Thatcher ruled, with a (too) few years in between that were not terrible.
BREXIT accelerated this but isn't the root cause - the root cause has to do with structural problems: https://www.ftadviser.com/uk/2025/7/21/the-uk-is-losing-weal...