Or are you looking for the vegetarian version? I've heard that Marmite or Vegemite make a good substitute.
Here's the ingredients list for
Bisto Pork Gravy.
Potato Starch, Dried Glucose Syrup, Salt, Flavourings (contains Milk), Flavour Enhancers (E621, E635), Vegetable Oil, Colour (E150c), Dried Pork (0.4%), Emulsifiers (Soya Lecithin), Onion Extract, Rosemary Extract.
Here's one for the
Knorr equivalent.
Wheat Flour, Maltodextrin, Hydrolyzed Corn Gluten, Whey Protein Concentrate (Milk), Yeast Extract, Monosodium Glutamate, Salt, Sugar, Partially Hydrogenated Soybean Oil, Onion Powder, Natural Flavors, Caramel Color, Disodium Guanylate, Disodium Inosinate, Bacon Fat, Garlic Powder, Spices.
Hmmm....I guess you get actual pork in their pork gravy.