Sophbasi

There does seem to be some conflicting advice on this. We are a small publisher supplying books through an online platform and sometimes direct to bookshops. On the basis on what I read here and in the HMRC notice, we are not required to charge VAT on books we send out? So if that is the case, that begs the question as to why we are charged VAT on carriage by our printer and warehouse? What is the basis of this charge?