Thank you so much for all of your advice and help over the past few months. Sprout has landed! The Puppy whisperer is my new bible, though Sprout hasn't grasped the whole toilet situation yet and so far is just hanging on!
We collected her this afternoon, she spent the journey (one and a half hours) cuddled up asleep in the crook of my neck. She has spent most of the day asleep, but has eaten a bowl of food.
The cats are giving her and us evils, but are still coming to us for occasional cuddles, which I hope means they don't hate us!
So thank you all again, I am in love!