National Institute for Health and Clinical Excellence - an independent organisation responsible for providing national guidance on promoting good health and preventing and treating ill health. NICENational Institute for Health and Clinical Excellence - an independent organisation responsible for providing national guidance on promoting good health and preventing and treating ill health. NICE had produced a clinical guideline on the recognition and assessment of coeliac disease. had produced a clinical guideline on the recognition and assessment of coeliac diseaseA condition where a person is unable to eat gluten as it makes their body attack itself. .