Well the HV called back today.
She says she has spoken to the preschool and they haven't noticed anything (which is odd as they told me when I said she would be calling, that she has her "moments"), but that they also said that it is very structured there so she would be likely more settled.
They are apparently watching her over the next few weeks, talking to the HV again, then I have to go and see the HV to discuss where to go from there - whether I want to leave things and see how the progress as she gets older/do more/ probably offer "parenting advice" as its clearly only me who has an issue therefore me that is doing something wrong with her
Part of me thinks yay, its not causing any problems at school, and the other part is back onto "am i imagining it/making it up?"
Guess I'll let you know more in a few weeks....