The UK between 1945 and 1985 was practically a communist country. The government owned significant portions of industry, housing, healthcare, transport, manufacturing etc. Vital industries including coal, steel, water, electricity, gas, railways, and airlines were nationalized under the Labour government's program following the Second World War. The National Health Service (NHS) was established in 1948, offering government-funded healthcare to all residents.
IIRC correctly in the early 80s the highest tax band was 95%.
I asked GPT4 to convince me that the UK was actually a communist nation during that time, but it won't bite: "While the UK did assert considerable control over various industries from 1950 to 1980 (paralleling elements of communist societies), its democratic governance, surviving private industry, and support of property rights exhibit significant deviations from true communism. The era could more accurately be described as an age of robust social democracy." (emphasis mine)