Standard of life and energy consumption are clearly correlated, though in the long-term improved efficiency makes this hard to evaluate.

The fact is, the UK has undergone a nearly complete deindustrialization in that period. e.g 'cars made per capita' is about 1/3 what it was. Domestic white goods are gone. Commercial shipbuilding is gone. Consumer electronics is gone. Domestic textiles are gone. Steel smelting (and nearly recycling) and machine tools are gone. For centuries(decades) these things were quintessentially British.