Mamapain, thanks for the link. I've read bits about kosher before but it's interesting to read it in that context. I'm a little disturbed if I'm honest, it seems a bit extreme, but I respect your beliefs and can understand why you don't fully follow the practises in the link.
This is a cut and paste for those thinking all animal parts aren't used, in fairness some bits aren't....
Uncooked meat products
Certain parts of the carcass of mammalian species may not be used in uncooked meat products (brains, feet, small and large intestine, lungs, oesophagus, rectum, spinal cord, spleen, stomach, testicles, udder ). However, uncooked intestines may be used as casings (for sausages , for example). Note also the banned material in the following paragraph.
Specified risk material (SRM)
The sale of SRM or any food containing it for human consumption is banned, as is its use or sale for use in the preparation of food for human consumption. For bovine animals, SRM varies according to whether it originated in the UK and its age, but generally includes skull (including brain and eyes ), tonsils, spinal cord, thymus, spleen and intestines. For sheep and goats there are also differences for age, UK and non-UK animals, but generally SRM includes skull including brain and eyes, tonsils, spinal cord and spleen.