Richard's suggestion reminds me that I once met someone who owned a factory that made syringes pre-loaded with a measured dose of some kind of medicine. It had a short shelf life, and he was its sole supplier, so if the factory was unable to supply for any reason, people could die.
When he arrived at our BS 25999 course his question was something like, "How do I do business continuity for my factory?" One significant constraint was that the manufacturing equipment was expensive and only built to special order. The lead time was longer than the shelf life of his product, so a BC plan that involved stock-piling enough product to sustain patients until the factory could be rebuilt would not work. Even if he could rebuild the factory, it would take so long the product's reputation for reliable supply would be trashed.
He owned some significant patents, I think, and could continue research, marketing and sales with fairly simple BC plans. He realized that his key product was, not the manufacture of pre-loaded medicinal syringes, but their reliable supply. By the end of our course he was seriously considering outsourcing manufacture to two contract manufacturers, separately owned and in geographically different locations, and closing his own factory.
Hope this helps,
Pat