I think the Labour fear is that people won’t bother to vote thinking a victory for Labour is guaranteed and their messaging is changing to get the vote out.
Our Labour candidate came up my garden path whilst I was sitting out there on Saturday evening. (Canvassing at 8.45pm on a sunny June Saturday - the dedication!)
He was completely insistent that nothing is a given and that people must vote. He kept saying, 'It's such a close thing' and 'Every vote matters'. It was as though it had been drummed into him.