http://www.bbc.co.uk/programmes/b00jkr1qIt should be coming on iPlayer soon (31/12/2009). I listened to it the best I could, but I was busy doing dishes and trying not to get too upset on NYE. It seemed a bit slanted against PBS (and pro-stricter controls), but other people can be the judge of that. I just thought someone might be interested. If it's more appropriate to be in Visas and citizenship, mods please move.
ETA: They specifically cover Student Visas, inter-company transfer visas, and post study work visas.