We did dairy-free trial with Murray and were advised to start off with dairy in products (eg biscuits), then try a spoonful of yogurt, then cheese, then eventually, milk. Lots of people can tolerate some kinds of dairy depending on the intolerence (I am fine with everything except cold cows milk) ....
I would ask for a re-referral to the dietician as Neocate isn't really a long-term solution.