from tomorrow you'll be able to buy all purpose nitrite curing salt from the store, it is sodium nitrite and sodium nitrate mixed with salt and replaces the salt and saltpetre or cure 1 or 2 in recipes.
ie if a recipe calls for 45 grammes of salt and 3 grammes of saltpetre replace both ingredients with 45 grammes of curing salt.
This curing salt has been specially blended by my supplier and will take the guess work out of curing, it is also safer to use than using pure saltpetre or cure 1 or 2
Franco