Oh come on ACE - you have not tried the ambrosia of the gods?
Others may not agree mind you.
Normally shops sell the mass produced with globules of fat in it but one should get the stuff that is without. Had some in Scotland that had, what I describe as hairs, on it and skinless. Now that was better even than the Shropshire stuff.
Either with globules of fat or without it is all bonded in a, usual, sausage form and comprises of dried blood. (Now that may put you off your tea)
A company in Inverness sell it, skinless, together with white pudding and haggis pudding. Oh to die for...