"Brains, lungs, rectum, stomach, feet, oesophagus, spinal cord, testicles, large intestine, small intestine, spleen and udder."
This list has actually just recently been banned from school lunches in England. Apparently these were allowed before?!
So the answer to what that mystery meat really is has been answered....Rectum!
Go to http://www.tes.co.uk/2237483 for the actual article.