As promised, some Mark Steel lectures for you to download (Right click and select "download file" or similar command in your browser to save to your local machine).
Warning: these are large files that are best downloaded over a broadband internet connection and even then you should be prepared to wait for a while depending on the speed of your connection.
Chaucer (320x240 mp4 file - approx 78 MBytes) - (480x368 mp4 file - approx 230 MBytes)
Cromwell (320x240 mp4 file - approx 83 MBytes)
Descartes (320x240 mp4 file - approx 78 MBytes)
Vive La Revolution from YouTube