I've been doing a lot of digging/research and I have come up with this.
https://www.gov.uk/guidance/immigration ... -or-parent
As my OH will be on a "fiance visa" and this is limited to 6 months with restrictions i take this to mean "limited leave" and meaning these rules would apply to our situation. She does have sole custody of her daughter with court documents to prove such. there are no close relatives that could look after her daughter in ukraine.
The point that is confusing me now is "(b) the applicant must have made a valid application for entry clearance as a child;"
I take this to mean that we do need to make a separate application for her daughter but i can't work out which category of visa to apply for. On the UK Visa and Immigration website it gives me these options:
Reason for visit: Settlement (i presume)
Visa type: Settlement (i presume)
Visa sub type: Child or other dependant of a settled person? (i dont think so as im not her parent)
Family Reunion- other dependant relative? (i dont think so because it seems to be for refugees)
Parent, grandparent and other dependant relative? (not sure but looks like my only option)
If anyone has some knowledge or input on this id love to hear it. Many thanks