The hon. Gentleman knows that the UK does not have such a constitution—we are strong supporters of a constitution, whether for the UK or for Scotland—and that the constitution is based on custom and practice. Legislating on the matter would be an appropriate safeguard.
The SNP approach would strengthen the declaratory and political effect of the clause. It also acknowledges the position of the Scottish Parliament and the long-standing sovereign right of the people of Scotland to determine the form of government best suited to their needs, as recognised in paragraph 20 of the Smith commission report, which states:
“Reflecting the sovereign right of the people of Scotland to determine the form of government best suited to their needs, as expressed in the referendum on 18 September 2014, and in the context of Scotland remaining within the UK, an enhanced devolution settlement for Scotland will be durable, responsive and democratic.”