Sorry
chilango you are not sure about what - that social mobility was higher in the 70s than now? Or that social mobility as at its height in the 70s?
The latter I think there is room for dispute on, the former is IMO pretty much nailed on. I'm not aware of any source that claims otherwise, even the government's own groups agree that social mobility has declined since the 70s.
The only way that you could argue that social mobility is as high or higher now than previously is (as I said above) to remove class from the picture, to go for the sort of post-class waffle that some love. But
Mr Moose claims that that is not what he is doing so I don't see how he can square his circle.