Delay/2nd ref likely to be more dangerous to Tories than Labour.
Danger to Labour is if anti #brexit is concentrated outside of Labour.
Remain thus becomes a vote winner even in Leave constituencies...
...but only if Labour takes lead & doesnt split remain vote.
There will (always has been) 10-15% brexit vote, but Labour shouldnt fear this. A tory party obsessed with EU will split/demotivate their vote - Labour just needs to be the remain party & its a home run.