(Reuters) - To leave, or not to leave: that is the question. Still. After Britain's historic vote to leave the European Union, there is no indication that a so-called Brexit will happen soon. It maybe never will. Prime Minister David Cameron, who is resigning, has said he will not take the formal step to an EU divorce on the grounds that his successor should. Because the referendum is not legally-binding, some politicians are suggesting a parliament vote before formally triggering Brexit. A [u]petition[/u] on the UK government's website on holding a second referendum has gained more than [u]3 million signatories in just two days.[/u] European leaders, facing the biggest threat to European unity since World War Two, are divided over how swiftly divorce talks should start. Paris wants haste and German Chancellor Angela Merkel is urging patience. European Commission President Jean-Claude Juncker said he wanted to "start immediately". And on Sunday, Scotland's leader said Scotland may veto Brexit altogether. Under devolution rules, the parliaments of Scotland, Northern Ireland and Wales are required to consent to any EU divorce, according to a report by the House of Lords. David Lammy, a lawmaker for the opposition Labour Party, said it was within parliament's powers to call a second referendum and urged that it be done. Perhaps the most vocal resistance to a British exit is coming from Scotland. Scotland, a nation of five million people, voted to stay in the EU by 62 to 38 percent, compared to the 54 percent in England who voted to leave. Under the United Kingdom's complex arrangements to devolve some powers to Scotland, Wales and Northern Ireland, legislation generated in London to set off an EU divorce would have to gain consent from the three devolved parliaments, according to a report by the House of Lords' European Union Committee. Scottish First Minister Nicola Sturgeon told the BBC on Sunday that she would consider urging the Scottish parliament to block such a motion. It is not clear, however, whether such a scenario would ever materialize or be binding. Sturgeon's spokesman later said that the British government might not seek consent in the first place.