Here's a terrific article by Michael Gleghorn that takes an extended look at the momentous series of talks C.S. Lewis provided for the BBC in the earliest days of World War II. The notes for that series were eventually organized into Book I of Lewis' Mere Christianity, one of the best and most popular works of basic theology ever.
A former history teacher, Gleghorn is now a research associate with Probe Ministries, one of the best apologetics and Christian worldview sites on the web. He holds a B.A. in psychology from Baylor University and a Th.M. in systematic theology from Dallas Theological Seminary.
The article, by the way, is "C. S. Lewis, the BBC, and Mere Christianity" and you'll find it at Gleghorn's site right here.