I'd just like to let all readers know that I have finished the book Never Let Me Go, as opposed to only having seen the film. Honestly, read the book. It is much better than the film. I must admit, I often like to see the film then read the book as that way round your experience of the story can only improve. Otherwise more often than not you'll be disappointed.
Anyway I just thought I would recommend that to you all. To read what I thought about the story itself, check out my old post http://the-english-review.blogspot.com/2011/02/being-complete.html which is based on the film but the concepts are, of course, the same.