Well, she was 18 months old and eating plenty during the day, they shouldn't need that amount of milk during the night, they should be able to sleep through by that age so I took the chance. I ensured that she was full enough at bedtime with porridge. My guess was that she was needing the milk to settle rather than to fill her up. Also, she didn't want breakfast as she'd had enough to fill her during the night.
I ensured that she had enough sleep during the day, and at the right time, imperative as overtiredness is a major contribution to nightwakings. This was down to trial and error but I did work around 5.5 hours. ie wake up 7am nap 5.5 hours later, hopefully for 2 hours and then bedtime 5.5hours after waking from her nap. Then I went to bed at the same time as her and stayed there and that way I coped better with the nightwakings. When she woke I gently put my hand there to tell her it was ok and I was there. She cried, lots and I just reassured her, eventually, after a good few nights, she started to respond and go back to sleep with my reassurance.
It was hard, I was alone (DH was away in Boston) and there were nights when I thought I was going to crack, but with the help of the ladies here (Sarah (henry'smama was a godsend) I got through it. DH was away for 6 weeks and although I hadn't got her completely sleeping through the transformation was a miracle in his eyes.