Sorry haven't been paying attention to this thread...
Cll - defo get your sister to email me, I can also put her in touch with a single adopters group (domestic and overseas) as well as the group which encompasses single mothers of all sorts.
It is theoretically possible for a single woman over 40 (I wasn't over 40 when I started) to adopt in Uk but in practice is very rare unless you are prepared to adopt a much older child or one who has been sexually abused which they don't want to place with a man in the family. I would consider this in future but not as a first child IYSWIM.
There are pleanty of mixed race children available but social services still seem to be VERY resistant to placing them with non-white familes - even if they had a white single mother, they won't place with a white single mother. I understand that a few councils may be reconsidering that practice.
I am on many US webgroups for adoption and there is certainly a marked difference in attitude to adoption over there. Americans seem to see adoption of any kind as a good thing, I'm sure if its cultural. We in the Uk seem to see adoption very differently -
Intercountry adoption = rich middle class families buying babies
Domestic adoption = very worthy and a "good" thing but obviously every child is damaged and will become a mad axe murderer.
It does wind me up - in fact I'm much more militant about "allowing" people an opinion than I used to be. But I've alreday got myself into trouble once on MN by being outspoken about Intercountry adoption so I'll shut up now!
(PS Inter-family adoption does happen in the UK but is rarer than it used to be, my Aunt was adopted by my grandparents when my grandma's single sister had a baby. This was in the early 50's though.)