Yes it's been talked about regularly over the past few years
Doesn't seem that likely at the moment. No Brexiteer MPs are going to vote for it and while there's a majority in Parliament for Remain, enough of them are worried about the backlash of 'ignoring' the referendum result and 'betraying' people who voted Leave that they're unlikely to go for it. There's also nothing like a majority consensus in terms of what question to ask: whether that's 'Accept May's deal' or 'Remain', 'Accept May's deal' or 'Leave with no deal', or something else. More than two options would almost certainly result in a deadlock.
One other option would be a General Election, with the Tories backing Leave and Labour Remain. Given that there's something of a constitutional crisis at the moment that's not impossible, and has the big benefit of delivering a mandate even better than the original referendum, without as much baggage as simply trying to vote again. Sadly that's highly unlikely because the Tories are split and it would pose an existential threat. The whole of Brexit has always been about trying to get the Tories to unify around a single position on Europe - destroying the rest of the country is just an accidental by-product.
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Tue 19 Mar 2019, 8:16,
archived)
One other option would be a General Election, with the Tories backing Leave and Labour Remain. Given that there's something of a constitutional crisis at the moment that's not impossible, and has the big benefit of delivering a mandate even better than the original referendum, without as much baggage as simply trying to vote again. Sadly that's highly unlikely because the Tories are split and it would pose an existential threat. The whole of Brexit has always been about trying to get the Tories to unify around a single position on Europe - destroying the rest of the country is just an accidental by-product.