Early postwar Britain was notable for cartelisation, nationalisation, weak competition policy, and protectionism.

FORBES: Correcting The Economist on long run growth

Americans have a strong impulse for course corrections and a sense that their greatness could be lost, but let's say for argument's sake that the U.S. is a declining superpower along the lines of postwar Britain.

FORBES

The 1970s marked the climax of Britain's postwar decline, in which "the English disease" overweening trade-union power was undermining the economy by strikes and inflationary wage settlements.

WSJ: Paul Johnson: The World-Changing Margaret Thatcher