The Swiss supreme court has struck down a referendum because the voters were poorly informed about the issue. The issue was about the different ways unmarried couples and married couples are taxed (kind of like “the marriage penalty” in the US).
The Swiss are old hands at referenda and require the government to inform the electorate what’s at stake. No such requirement existed in the UK.
Swiss constitutional referenda require a national majority and majorities in a majority of the canton. The UK took no notice that it is a devolved system with four nations in one country. The UK referendum did not win a majority in a majority of the four countries. Unambiguously it was a constitutional matter.
The referendum did not provide for any but a binary decision. Swiss referenda are not necessarily binary.
Referenda are so build into the Swiss system that the parties organize coalitions so as to deal with the possibility of referenda. The Swiss can have a referendum to repeal a law or to change the constitution. Referenda are foreign to the British Constitution and undermine parliamentary government as is so clear now.
Referenda are initiated by citizens in Switzerland. The referendum was called by the government to paper over divisions in the Tory party.
As Emily Latella used to say “never mind”