I'm talking generally across the world, and not just referenda.
> the original remain/leave referendum that happened a few years after joining
That wasn't constitutional change. Nor was it binding.
This referendum was also non-binding, it's right there in the act of parliament that authorized it.
Of course once Parliament agreed to invoke article 50 the referendum became irrelevant. Parliament - specifically the Tories, Labour, DUP, UUP and UKIP mps who decided to take us out of the EU with no deal, not the referendum.
320 MPs can change the UK constitution (although there are some protections with the House of Lords), which is the anomaly globally.
