“The political “lessons” are more or less insurmountable – in this unfortunate world, we have to live with the fact that big projects are going to be led by people who come across well at interview, and that this is very much less than perfectly correlated with ability to do the job.
But the really crucial lesson would be “if something is going wrong, review whether it is viable and don’t hesitate to reverse course; abandoning a failed idea early is a good thing which should be to your credit”. Instead, the UK policy structure seemed to learn “don’t attempt anything big, because if it fails you will be blamed”