My Stop Start has't done it's thing for over a week now. I've done plenty of long journeys so not a DPF regen issue (that seems to disable it for a while) and nice and warm weather so temperature not a factor.

Same in all Drive Select modes so I don't think that's a factor.

It shows the A with a circle on the DIS with a line through it when I am stopped and in neutral, like it would do if too cold to operate.

Any ideas? Service due in a few weeks so I can get them to look at it then, but curious as to what it could be.