@Algoquick the other DC were woken by my screaming and came in, yes. They looked a bit bewildered but not frightened.
However I was screaming pretty loudly at this point so DH took the DC out to get them dressed.
Then I sort of felt something and thought erm could that be...?
Then DH came back in and looked around me and said a few choice words. I asked him if the head was out, and he told me later that the baby was blue, which is of course normal.
He said something like hang on a minute don't push, and he said afterwards that the cord was around baby's neck, so he had to deal with that.
I actually wish he'd taken a photo, not to keep and have pop up on timehop, but just to see what he was dealing with.
Then he said Ok push again and the baby was born quickly.
I figured we should call an ambulance for I don't know what reason, so they came and dealt with the cord and took me to hospital where the placenta was delivered.