I would try and see the Dad at a show if you can. (It is nice to go to shows and see the dogs anyway and you can meet other breeders and speak to the stud dog's owner) Is Margaret getting the stud dog on 'breeding loan' or is he coming to England to show? (sorry, slightly confused, excuse me if I am being stupid!)
I do know of Layla, but haven't seen her myself, seeing as I am stuck mainly showing in Ireland for now. I do know however, that Margaret is far more experienced than I am and an extremely reputable breeder. She has a great record and reputation for both health and temprement and I seriously doubt she would breed any bitch without serious consideration and reason. Layla does have good show results, I know that.
To be honest, the fact that Margaret has chosen to have her bitch live somewhere else suggests she is putting the bitch first. You have seen her set up, she could have quite happily just stuck her in a kennel alone or with another bitch. One of our bitches (not the one bred by Margaret) would never do well in kennels, she loves people far too much. I would probably describe her as sensitive, but out of all of ours, she is the one everyone loves the most. She is always after a belly rub or cuddle and just loves humans so much more than other dogs. On walks she always wants to say hello to owners before dogs.
I also know that Margaret has two perfectly good stud dogs of her own she could have chosen to use on her bitch, but instead she has (presumably) gone to great lengths to get the right stud dog, not just a convenient one. I know she recently took a bitch to France for a mating (this litter maybe) and also had Layla's father for six months from Norway to introduce new blood lines.
I do get what people mean by being wary of 'sensitive' but I genuinely believe if it were any sort of problem, Margaret would breed from her. Plus, she has been shown and done well (one class first out of 23, which is some going!) and temprement is paramount for Goldens.