I don't have any "sacred" brands these days; I usually order the supermarket own brand equivalent of the mainstream brands, but because other people are doing the same, I often find that they'll substitute the "market leader" instead. You mention Bisto in your post; I never actually order Bisto, but when I last ordered Asda's own brand gravy granules it was substituted with Bisto. Similarly, I like Branson pickle (small chunk), but these days I just order the Asda brand instead, safe in the knowledge that it'll be out of stock on the day and they'll supply the brand that I really wanted in the first place!