A lesson we might take from that however is....if we were to start production of new Spitfires again, can you imagine what it would cost to open up that production line and fabrication of all the parts, engines, and such!
Finding a way to keep a line tooled up and producing even very limited numbers does have some merit.
Sadly, the mis-prioritization of spending by Governments gets in the way of that as spendable funds have become scarce for any number of fuzzy feel good notions that have had severe un-intended consequences for government.