I read this quite quickly - it was a nice easy read that you could easily pick up where you'd left off. I enjoyed it for what it was. I did, however, feel like it was "Mumsnet - The Novel", right down to the mention of Greggs, almost as if the author had read lots and lots of threads on MN and then incorporated them into story, iyswim.
My favourite character was Joanne and I felt like there could have been more made of her character and background. Lisa was a good character, but just as much as a cliche as Kate, although for me, both of the mothers were a little too much of one extreme to the other to be realistic. I also found the fact that Kate was actually a nut job a bit of a typical ending - ie. even though she's the one with the "perfect" life and trying so hard to be a good mum, she's crazy and harming her children, whereas Lisa, who's not actually trying that hard at being a great mum (because lets face it, she's not) is the better mum after all. I'm not sure I'm explaining that very well. I felt Kate's story would actually have been far more interesting than Lisa's, but then that would have been a completely different novel and not such an easy read.
I found the thoughts of the abuser uncomfortable to read and not sure if they were really necessary to this particular book.
I agree that it would make a good TV adaptation and as I said before, I did enjoy the book overall. Thanks for the free copy!