Ok - well the bit that says that isn't referenced at all so I would a) ignore it and b) ask at your next appointment why if there is such a lot of evidence they don't put a reference in.
I'm very disturbed by a number of things in that leaflet actually.
They note that babies born to overweight mothers have low breastfeeding rates - and yet their answer is to repeatedly reduce the woman's confidence in her ability to breastfeed. How do they propose feeding the milk expressed antenatally btw?
I take serious umbrage to 'A test to diagnose diabetes will be booked for you between 26 and
30 weeks (Glucose Tolerance Test - GTT) and a leaflet with
detailed information will be sent to you.' I think what they mean is that the GTT will be offered to you as, unless Epsom has suddenly become a dictatorship, pregnant women retain autonomy over their bodies.
Also 'If you have additional medical problems, you will be followed up
by the relevant clinician; otherwise you will continue to visit the
Cedar clinic at regular intervals.' - errr again I think they'll find that you the patient will decide what is helpful to you.
'The most appropriate place of birth for you is the Delivery Suite,
where you will receive one to one care by a midwife, but will be
additionally under the doctor?s care. The Birth Centre Use is not
applicable in your case, as it is used only for low risk pregnant
women. If you want to consider this or even the possibility of a
home birth, we will arrange a meeting with the obstetric/
midwifery team. You, also, are entitled to have access to a
Supervisor of Midwives to discuss your birth plan.' - they mean they consider the most appropriate place to be the delivery suite. They would recommend it, they can't empirically say it's most appropriate for you. I can't really begin to articulate how much that paragraph has put my back up!
I notice the research midwife's number is at the bottom. Give her a ring and ask her to send you the breastfeeding studies. The 'solution' they propose isn't going to help with attachment difficulties anyway. 
AAAAAAAAAARGH! Am really cross 
It's a good job I'm not having anymore dcs - I'm obviously far too bolshie!