SACN were actually pretty negative:
"The Committee was unable to identify any published scientific evidence to support a claim that ?Good Night? milks offer nutritional or other health advantage over the use of infant formula or follow-on formula."
"The Committee is concerned that the use of these products to ?settle? babies at night could promote poor dental hygiene." [i.e. bottle tooth decay because parents might put babies straight to bed without cleaning teeth afterwards] It's noteworthy that in their suggested 5 step 'bedtime routine' the C&G website don't mention that teeth must be cleaned after the product is offered.
"The Committee was unable to identify any published scientific evidence to support a claim that ?Good Night? milks offer nutritional or other health advantage over the use of infant formula or follow-on formula."
"The Committee is concerned that the claims made could undermine breastfeeding, as either product could replace or displace the night-time breastfeed."
"Specifically the Committee are unaware of published scientific evidence to support the statements made about ?settling the baby for the night?, or being ?gentler on the baby?s tummy?."
"The Committee is concerned that such statements encourage parents to believe that it is desirable for a baby to sleep longer at an age when healthy infants show considerable variation in normal sleeping behaviour. There is also a risk that mothers may consider the product suitable for ?settling? their infant more than once a day and use these products on occasions additional to bedtime, or even use them to ?settle? infants younger than six months."
Not quite sure why you think the only difference is thiamin ? The table on page 5 is pretty clear that the goodnight milks contain additional potato starch and rice flakes (C&G) or Corn Starch, pre-gelatinised rice flour and wholegrain oatmeal (Hipp) when compared with the equivalent brand follow on milk.
The committee hardly paints a positive picture .