IBD Club - Information for sufferers of inflammatory bowel disease (ulcerative colitis and Crohn's disease), written by Addenbrookes Hospital. - http://www.ibdclub.org.uk
Digestive Disorders Foundation - UK charity with a good range of online information, including constipation, diarrhoea, irritable bowel disease, liver disease, colitis, gallstones and cancer. - http://www.digestivedisorders.org.uk/