The Supreme Court decides a reference under section 32A that the Bill (or any provisions of the Bill) relates to a protected subject-matter requiring a two-thirds majority in the Parliament to pass the legislation;
The Supreme Court decides a reference under section 33 (of the Scotland Act 1998) that the Bill (or any provisions of the Bill) would not be within the legislative competence of the Parliament; or
The Secretary of State makes an order under section 35 to prevent the Presiding Officer from submitting the Bill for Royal Assent because the Bill (or any provisions of the Bill) may adversely affect the operation of reserved law, or may be incompatible with international obligations, defence, or national security interests.
SPICe...