- go to the online shop (They're based in Canterbury)
Dr Tom Greenfield (who wrote the Foreward to the Genotype Diet book) runs/owns the practice and is very helpful. (Dr Tom is also a "Blogger and Columnist" and, I believe, has Dr. D. coming over to the UK for a Epigenetic Conference later this year...no less)
I got my supplements / Lewis secretor typing and Swami Xpress from them. Very good service...
All the best,