I studied Mech Eng at college; no-one does that who doesn't want to be an engineer. When I graduated in the mid-90s there were no jobs, so I went into high-tech. But my CV is still floating around, and I occasionally get called by recruiters in engineering. Now I am no rock star, I am paid well (market rate) but not extravagantly so. But these engineering jobs pay a fraction of what I earn, for the equivalent years of experience. And they wonder why no-one wants to do it?
This comes back to the old class system which is still strong in the UK. No matter how educated, an engineer is not "one of us" to the management class, and will never be paid fairly in the old industries, never more than a paper-pushing middle management bureaucrat who went to the "right" school. Only high-tech (enlightened) and The City (where managers are so well paid that they don't feel threatened) pay technical people fairly.
Anyone smart enough to be an engineer - and there are plenty who want to be - is smart enough to not be exploited in that way. And that is why manufacturing died in the UK.