my guess is if outcome is 52% for brexit, they'll still stay with limited political damage
Absolutely no possibility of this at all, Jack.
The Conservatives only have their very slender majority at all because they campaigned on a specific promise to hold a referendum and be bound by its result. If they don't leave the EU (even on a 50.001% vote to do so) there would be pandemonium and a general election: not only is every other party in the House opposing them, but about 75-100 of their own backbench MP's as well: they wouldn't last a week without a "no confidence motion", which triggers a general election.
So the referendum may not technically be binding in law, but it certainly is in practice, as it would take only a day or two to make it binding in law by removing the government, if they decided not to honour the result. Absolutely nobody here imagines otherwise. It's every bit as binding as if it were in an Act of Parliament, and everyone - on both sides - knows and openly acknowledges that.
At the moment, the consensus of "informed opinion" (which can, of course, be wrong) is that a 52% vote to stay is looking much more likely than a 52% vote to leave. It's going to be close, though. Probably closer than the Scottish independence referendum of last year.
?
