Who killed Britain?
This Danish article has the correct answer: Thatcher.

"Around two-thirds of Britons believe the country is in decline, and it's not hard to see why. Real wages are lower than 15 years ago. A third of British children grow up in poverty, many millions have to skip meals every single week. The UK is not just significantly poorer than France, let alone Germany or Denmark. The poorest 10% of Britons now also earn less than the poorest 10% in Slovenia...

"A particular story of decay still plagues the country... and it goes something like this: the 1960s and 70s were a dark time... Then Thatcher came and saved it all with economic common sense, tax cuts and a necessary showdown with unions... But that narrative is fundamentally wrong... Margaret Thatcher did not increase the growth of the British economy... The post-war period, including the 1970s, was the time of high growth and major transformations... an economic model reminiscent of the one found in the rest of Western Europe was established... In the 1980s many countries lowered taxes, removed regulation, encouraged deindustrialization and privatized public enterprises. But Britain took exceptionally radical action. Today, it is Europe's most financialized economy, with very high inequality - and a very low level of both public and private investment in the economy.

"Four criminal acts have destroyed the economy.... Monetarism in the 1980s, deregulation in the 80s, the austerity policy of the 2010s and Brexit. All motivated by the same economic thinking... free market fundamentalism."

https://www.information.dk/udland/2024/04/hvem-slog-storbritannien-ihjel?kupon=eyJpYXQiOjE3MTM1MjQ5MzUsInN1YiI6IjIyMjUyMDo4MTkwMzUifQ.9_7QOpyn65Fg3-8EP-Enfg