Let’s see: suppose the bar was set at 75% and that was the turnout. Let’s say that the required majority was 60% and the result was akenaton’s 61%. That’s still well under half the electorate voting for the change. To ensure a majority of all those entitled to vote, which I would say is the minimum requirement to make an irreversible and highly significant change, a turnout of 75% would require a majority of just under 67% voting for the change. That’s where I would set the bars. In those circumstances, no- one on the losing side would be able to claim no majority/mandate for change. One of the divisive elements would have been removed. That’s a much better shot at real democracy, though I still don’t believe in referendums anyway. Of course, I can see why leavers wouldn’t have liked it.