Hi Andrew,
Asked about "not followed by" for my personal knowledge and it's an alternative way to go if I wanted to use your original code.
Pages 29 - 30 are new so before that there's no change. I haven't actually specified > page 28 'cause there's too many inconstancies in the format of the end (roll-over) page numbers. Seeing the index was created without Word's indexing tools, it'll be better to make these updates manually