Final answer:
Clement Attlee, former Prime Minister of Great Britain, embodied key principles like respect for the arts, social liberalism, and an open-minded approach to democratic socialism, contrasting with other European socialist parties that were more radical.
Step-by-step explanation:
Respect for the arts, social liberalism, and an open-minded approach to democratic socialism were key principles most closely associated with Clement Attlee. As a leader of the Labour Party in Great Britain, Attlee's tenure as Prime Minister, from 1945 to 1951, saw the creation of the National Health Service and reforms in social welfare and education, embodying these principles. The Labour Party, particularly under Attlee, advocated for a gradual democratic approach to socialism, contrasting with some other European socialist parties that pushed for more radical, revolutionary changes.