Matters which may be raised only on a substantive motion

20.10As indicated in the following chapter (para 21.23 ff), certain matters (relating to the conduct of certain categories of person or office holder, such as Members of either House or of judges of the superior courts of the United Kingdom) cannot be debated except on a substantive motion which allows a distinct decision of the House. Critical language of a kind which would not be allowed in speeches in debate may therefore be permitted in motions of this form, but are not allowed in other forms, such as an amendment or the title of an adjournment motion.