The Cadbury lecture I gave in Birmingham just over a week ago is now available on Youtube here:
Or watch it on Youtube here. The lecture is 48 minutes long. It features much of the powerpoint, but some slides have been omitted for copyright reasons. All of the Q&A is also features, though under the veil of darkness.
Update (12 February 2013): I have now made the audio available as an extended episode of the NT Pod. This version has the advantage of enabling you to hear the talk without seeing the speaker constantly waving his arms around.