Thanks everyone for your comments, I have found it all really interesting, especially as there are differing opinions which I was not expecting!
Twinkle - DD is not quite 12 months, almost tho (2 weeks or so!). Her real food (solids) eating is great, she has a great appetite, enjoys and eats a good amount of a varied diet, even with the large quantaties of milk she consumes. Her breakfast is the only area where she does not eat so much, and here I have cut down the amount of milk as she wakes up later these days (yey!) and as such her milk intake is closer to breakfast time.
I guess the concern of mine, in respect of not drinking lots of milk after 12 months, and especially my partners is that she is a small baby, always has struggled to gain weight, although never a problem with eating, she burns off a significant amount of calories with what she currently eats, and I worry withdrawing the formula milk would reduce the calory intake. DP especially thinks she needs milk longer as she did not grow so well in the womb .
I personally agree that growing up milk is a marketing ploy, but its hard not be sucked in as they pull on the fact that mothers want the best for the children, and I myself am guilty of worrying that if I dont do what they say I will damage my child! (rational vs irrational I guess).