Gordon Brown promised a referendum on the EU Constitution. The Constitution was rejected in referenda in France and the Netherlands. It was then re-drafted as the Treaty of Lisbon. Is Gordon Brown still obligated to give the UK a referendum? Are the EU Constitution and the Treaty of Lisbon really that different?
They’re about 90% the same (if not more). All references to states or constitutions removed (no mention of national anthems or flags, etc). Some stuff was shifted around from the main body into annexes (no practical difference in doing that, as it’s still legally binding, but makes it less obvious)
I agree that if you make a promise for a referendum on the constitution, it should still apply to Lisbon. I have no polling data at hand, but my gut tells me it would fail.