Re: we've done the great leap forward.
That's the problem with predicting the next great leap forward though; you never recognize it until it is already underway. If you had asked the farmer with to mules what was going to improve his productivity he would have said "two more mules and another farm hand" not a horseless tractor.
Good points about the 1970s though. Sad how quickly we forget. It wasn't just GB, we did the same things on this side of the pond. Not sure if it was a group think that encompassed the world, or whether it was just a combination of enough big countries doing it all at the same time.