There was a time when offal of all kinds was available, but it appears those days are gone.
Items such as Kidneys, bot Pigs and lamb are very rarely found so no more Kate and Sydney pies.
Liver, or Lambs Fry as we call it here in Oz appears on the very odd occasion in the supermarkets and some times the butcher.
Tongue of any kind I have not seen anywhere and Ox tail is something from a long lost past.