The UK and France do have socialized medicine. As for the UK, it's officially a parliamentary, constituional monarchy, but the queen really doesn't have much of a say in anything.
So far, no nation has ever been truly Socialist. Many have adopted Socialist policies (UK, France, etc.) and many have claimed that they've had Socialism (USSR, China, DPRK, Cuba, Laos, Vietnam, etc.), but no nation has actually had a revolution that led to the lack of social class, and the economic system of Socialism.