Earlier quoted context omitted.
All of the parties apart from the SNP promised a referendum in their manifesto. The Green party and the Liberal Democrats had it in theirs for about a decade. The referendum was advisory, so it would have been possible for parliament to vote not to enact article 50. But parliament voted for it.
> All of the parties apart from the SNP promised a referendum in their manifesto. The Green party and the Liberal Democrats had it in theirs for about a decade. Not all the parties did. Labour, for example, also didn't. The Greens have always been fiercely pro choice so a referendum falls within their remit and LibDems have often flip flopped around the issue of Europe depending on what seems the most popular alt-vot…
I'd like to hear them!
Thanks to your comment I re-checked the Labour party manifesto for the 2015 general election and you are right. They do mention a referendum but only in the case of a transfer of power from Britain to the EU:
"Labour will legislate for a lock that guarantees that there can be no transfer of powers from Britain to the European Union without the consent of the British public through an in/out referendum."