What was the name of the BBC radio talks later adapted into C.S. Lewis’s Mere Christianity?

The BBC radio talks later adapted into C.S. Lewis’s Mere Christianity were called Broadcast Talks.

Lewis delivered the talks for the BBC during the Second World War, beginning in 1941. They were intended for a broad listening audience and explained common Christian ideas in clear, nontechnical language. The broadcasts made Lewis widely known beyond universities and literary circles.

The material was later revised and published in book form. The first volume, Broadcast Talks, appeared in 1942; a second, Christian Behaviour, followed in 1943; and a third, Beyond Personality, appeared in 1944. These three works were subsequently collected and revised as Mere Christianity, first published in 1952.

Readers sometimes answer “Mere Christianity” because that is the familiar title of the collected book. The question, however, asks for the original broadcast title. The talks were not called The Case for Christianity, although that title was used for a later book assembled from related material.