It’s all on in Downing st

Theresa May and her husband Philip John arrive for the concert at the Elbphilharmonie in Hamburg

As taken from Lab Tested’s comment in the General debate:

The No Confidence Vote on Theresa May started at 7 am NZ time and will be completed by 9 am NZ time. The results will immediately be counted, verified and announced.

She needs a simple majority of Conservative party MP?s who decide to vote

Reuters explains

If May wins, she remains in office and cannot be challenged again for 12 months. If she loses, she must resign and is barred from standing in the leadership election that follows. However, a significant mutiny could make her leadership untenable.
It?s a secret ballot, so anything can happen. Even if she wins, the size of the No Confidence vote will be important as it will be difficult for her to get any Brexit deal past Parliament if a significant number of her party have lost confidence in her.

If every single Conservative MP votes, then the winning line is 158. The No Confidence vote was triggered by letters of No Confidence from 48 back-bench MP?s. So NO is already 30% of the way there.

It will be an interesting morning. The future of Britain and Europe is unfolding as we watch.