The name on the "banned list" is Dr. Michael Alan Weiner, one of the foremost scientists in the US. He has written over twenty books on herbal medicine, health and nutrition. He spent years in tropical forests looking for plants with medicinal value.

Here are the first few books I found on Amazon.com/ written by him:

Healing Children Naturally by Michael A. Weiner and Kathleen Goss (Paperback - Jan 1, 1994)
Maximum Immunity by Michael A. Weiner (Paperback - Mar 1, 1987)
The Antioxidant Cookbook: A Nutritionist's Secret Strategy by Michael Weiner and Janet Weiner (Paperback - Jan 1996)
Herbs That Heal: Prescription for Herbal Healing by Michael A. Weiner and Janet Weiner (Paperback - Jan 1, 1994)
The Complete Book of Homeopathy by Michael Weiner (Paperback - Nov 1, 1998)

Sounds too dangerous to be allowed in Britain?