What about these? Not sure about the sulphites.
Ingredients:
Pork (97%), Salt, Water, Coriander, White Balsamic Vinegar [Wine Vinegar, Grape Must, Preservative:Sulphur Dioxide], White Pepper, Pimento, Preservative: Sodium Sulphite, Chilli, Filled into Natural Pork Casings
I make my own from just mince and seasonings using Carluccio's poaching method.