There was a very illuminating article by Simon Jenkins in yesterday’s Guardian under the banner

In it Jenkins writes the biography of the HS2 rail project — and how over the years it has been fiddled and fudged by governments and interested parties when there is basically no business case, or any other justification, for it.
Whether you agree with Jenkins or not, it doesn’t make very edifying reading.
My view has always been that HS2 is another classic example, like London’s proposed Garden Bridge, of an unjustified vanity project which has got completely out of hand and sucked in politicians who can’t now be seen to back down. Heathrow’s Third Runway isn’t too far behind either. These mega projects are seldom more than politicians “willy waving”.
They’re all projects which need to be killed off — FAST!
If we’ve got that amount of money to waste spend then it would be better spent on more useful infrastructure projects. Let’s start with a couple of nuclear power stations to reduce our dependence on imported coal and dirty oil with a reduction in CO₂ emissions.
I despair of politicians, I really do. Doomed! We’re all doomed!