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No one is, though.
No-one would/should/could at the moment though. Better to watch the Tories continue to disintegrate as they fight amongst themselves.
Right now is not the time to come up with an alternative if you're in opposition. The earliest that needs to happen is after May's WA is voted down and the vote of no confidence stuff is kicked off.
Also, there's no time. and we've pissed any goodwill up the wall.
I agree that the current Government (and their stubborn position) has pissed any goodwill up the wall. But a change of Government would change that. A change of UK position would certainly justify an extension or revocation of A50 with a view to working out what happens next (second ref, etc).
No one is, though.
Labour is saying "Single Market", but what they then go on to describe is a single market for Capital, Goods and Services - but not, erm, Labour. And that's impossible.
Labour has the same red-line on FoM as the Tories, and as we've been told for over two years, the four freedoms are indivisible.
Also, there's no time. and we've pissed any goodwill up the wall.
We have to sign the WA, get into transition, then negotiate as a third country.
That, no-deal, or remain, are the only options available to us.