Thanks for your help everyone. But I'm beginning to get a little guilty that there is an entire thread now devoted to my early waking problem....

!!
Waking this morning was 4.45am, but I went and popped her dummy in and she went back to sleep until 5.15am! That is a first! She would never normally settle at that time. It was only half an hour but I was quite encouraged. I'm wondering if that was her body saying "no, it's not wake up time yet".
Cheers
E