So long story short, I'm in the process of writing a book about summer camp. I'd like to know what the procedure is on checking if businesses are happy for their name to be used in the book? I'm happy to provide them with an overview of the book and make sure there is nothing defamatory for their name. But what if they return to the email and say 'no'? Would it be (by law), ok for me to replace their name with a fictitious one that couldn't be traced back to them? This is just one of my burning questions to get answered!