In common with many other readers, I haven't finished this yet. It is my "book to read in the garden" but it so wonderfully hot (the weather, not the book) that I have to lie down indoors occasionally and contemplate the fate of Mark's characters, rather than read another chapter. Simon has a chip on his shoulder about class. Is this you, Mark? So he does stand out as a character. As does saintly Dr Emily, though only for appearances' sake I suspect. As for the other characters I, too, am confused at times. They seem to be living parallel lives in parallel communities, although I suppose that's the point. Unfortunately the protagonists are also interchangeable. So far I have very little sympathy for any of these people. Not because they are rich, middle class, smug etc. etc. But because Mark doesn't seem to dare dig deep into their souls or their psyches. There are, however, some LOL (yes, Mark, we all got that one) moments and this is a good debut novel, despite its irritating flaws. I haven't finished it yet but will send another message (if I'm allowed to) when I have.