M and J were Siamese twins. J was normal in every respect bar his conjunction to his twin M who had no long tissue and brain problems, who would die in a matter of months.
The trial judge ruled that simply removing the blood supply that J was supplying to keep M alive was comparable to the case of NHS Trust v Bland.
The parents appealed but their appeal was dismissed given that the children’s welfare would be best served by the separation (J would get a normal life and M would be saved months of painful, degenerative existence).