When I first saw this program back in the early 1990's IIRC, I was just starting my love affair with Morgans and I was completely on the traditional Morgan 'We've always done it like this' side.
At the same time I was also starting to become more involved in the business engineering/business consultancy side of things, and as the the years passed I learned more and more about how businesses survive in the modern world, and "If you always do what you've always done, You'll always get what you've always got" became my mantra in helping businesses to understand how to change their IT systems.
Now I realise both the wisdom of Sir John, and also the pragmatic acceptance and implementation of change in MMC. I now firmly believe that if they had stuck with the 'fully hand-built' approach, their cars would have become even more astronomically expensive than they are now, and the company would have gone the way of Bristol and their ilk.