Comment by VieEnCode

You are missing the mass destruction of assets of the wealthy in WWII and the increase in bargaining power of labour in the post-war years (perhaps driven by loss of life/injury for those of a working age). The post-war public sentiment, at least in the UK, was that the lower orders of society had fought the most and suffered the most, and there was an appetite for a new social contract that saw Churchill voted out from office and gave rise to the National Health Service, etc.