Went to a recording of the above BBC Radio 4 programme at College. Fascinating how they do it. Questions in by 7pm, audience by 7-15, live on air at 8pm. You get briefed on how to cheer, clap and generally be interactive, but apart from that, it's all live as it seems.
In fact the briefing and introduction could teach us a lot about leading corporate worship. We were clearly briefed, felt we could trust the people up front, we knew what response was expected, but we still had a sense of expectancy of the unknown.
The actual event had a real sense of drama and excitement, even though it's quite a cerebral programme. Some issues were clearly divisive, and it could have got quite heated.
Didn't get to ask my question, which is a minor disappointment.