It's that time of year again when the forces of greed and conspicuous consumption do battle with guilt and pious sentiment. So how do you have a merry and a moral Christmas? Michael Buerk and the panel settle down around the festive table to try to find out. Witnesses: Ruth Rosselson, writer, Ethical Consumer Magazine Julian Baggini, philosopher and author Jonathan Bartley, director of Ekklesia, a web-based think-tank promoting theological ideas in the public sphere. Susie Boyt, author and journalist.