Peacock has a lot of talks/lectures available (for purchase and free, I believe) at the Buddhist Publishing Group site.
JOHN PEACOCK is both an academic and a Buddhist practitioner of nearly forty years. He was initially trained in the Tibetan Gelugpa tradition in India and subsequently spent time in Sri Lanka studying Theravada. He has lectured in Buddhist Studies at the University of Bristol, and at present he is Associate Director of the Oxford Mindfulness Centre and teaches on the Master of Studies programme in MBCT at Oxford University. He has been teaching meditation for over twenty five years and is a Gaia House guiding teacher.