Thanks Pickle, Kwick and StorkAhoy. My post was a few pages back - this thread moves fast! Kwick, I think I found Access Fertility about the month I turned 40 and thought oh b***. Pickle - saving like crazy, yup, being doing that to buy a place. Sadly could not do both in time. Stork - that 18K - ouch. That is also partly why I didn't pursue this before I think, it is a gamble particularly at our age. Fingers crossed for all of you.
I have not replied because I've been chewing over what Stork said about maybe having everything I want with compromises. I think if I'm going to throw any money at this other than the testing I probably should go with an egg donor. That's one of the reasons I was looking at the seedy route, at least it's cheap. I am okay with an egg donor, but how would the child feel? No way of knowing! But I don't know about double donor; I feel a bit uncomfortable about that at the moment but am not ruling it out.
I know someone who I strongly suspect has had an egg donor baby, based on age and gap between children, but of course she has a husband to provide the other half. I've started thinking I would need to find a co-parent, but then maybe the father could more easily gain custody if he was the genetic parent and I wasn't? It could all go so horribly wrong! Unfortunately I can talk myself out of anything.