Thanks everyone.
She belonged to someone who lived in a flat and decided that she was going to be too big, and so put her up to be rehomed. 
I didn't take those pictures, but yes she is nervous, already much better than she was even this morning.
I spent some time with the lady from the rescuse this afternoon, so have a better idea of what she needs. She is supposed to be housetrained, she only came to the rescue yesterday and didn't have any accidents yesterday or overnight.
She has now weed twice in the lounge though, and we have been taking her outside religiously and encouraging her. Not one single wee outside and 2 inside isn't looking good. Dh even took her out for a little walk on the lead as we thought maybe she was used to going while walking, but no, nothing yet.
She didn't have a bed when she arrived, and she came with nothing of her own from her previous home, just our dog blanket, which at least smells doggy, even if not of her. I now have a bed for her, and put the blanket in it, and she has settled really happily in that. She has been asleep for most of the evening.
The only problem is, we always put the dogs in a corner of the lounge, it is right next to us (me) on the end of the sofa if they need it, but it is a quiet out of the way corner.
BUT, as she is weeing on the lounge carpet, I think I am going to have to put her in the kitchen overnight which is not great (cat can't get in and out either if she is in there) I don't have a crate and don't want to risk her weeing everywhere.
We did say no puppies, so we didn't need to deal with housetraining, but she is lovely and I am happy to work with her.
We are not really trying to train her, but some stuff sort of comes hand in hand with having her, so when she jumps up we are gently putting her down and saying Down clearly, then praising her.
Kids were playing with her in the garden and getting her to come to her name, and rewarding her when she did.