It's the trend that matters

There is glee at poll numbers which show Labour can govern alone.

But look at the trend. 

Labour down 10.8% points.

The Thursday poll preceding the leaders debate was similar. Labour down 5 points. That's what I think really threw the Labour leader and led to a tense, unconfident performance.

There's just under three weeks to go and the rate of fall is sharp.

Neither place is comfortable - on a low number rising or high number falling.

But I'm a stickler for trends.