In the EU this was indeed done for energy efficiency/emissions. Incandescent bulbs were gradually banned from normal sale, starting with the most energy hungry (diffused 100W) and gradually expanding until only low-wattage and special-purpose bulbs were left. Special-purpose bulbs cover a large variety for everything where switching didn't make sense, like machine shops or historic buildings. LEDs aren't mandated per se, but they are the most attractive alternative. And because this all happened before brexit the UK has the same rules, unless they revised any of them post-brexit

For the most part this was a very positive step. Prices for LED bulbs plunged when they went from the "premium" energy-efficient alternative to the default option. But you also get a lot of crap on the market, and stuffing LEDs in form factors designed for incandescent bulbs makes good electrical and thermal design challenging. Even for those brands that actually try