The UK temporarily outlawed older-generation lightbulbs, as well as putting in place a number of measures to reduce energy use. Even Conservatives, historically the party of industry, are now heavily committed towards energy-efficiency measures of all sorts (sometimes excessively so, like the push for those terrible heat pumps).
A decline in energy consumption is a good thing and is absolutely not impacting standards of living in any way in UK society. The reasons for discontent are many, for sure, but not related to energy use in any way. The main issue really is wage stagnation (and hence, availability of time) for the working classes.