Thanks for all the responses. I have just given DS2 his first bottle of Neocate, although he would only drink 110ml (he probably is adjusting to the taste and still feels crap). He was on Alfare for about 6 weeks and did wonderfully on it and then...BAM...out of nowhere he started getting diarrhoea again with horrible, sour smelling mucusy poos which he currently does pretty much every 2 hours. It's heartbreaking. He is such a trooper though and has the sweetest, most tranquil nature. His little bottom is red raw and even now has a blister on it despite me lathering him in Sudocream. The Children's Hospital here in Melbourne is testing a sample of his poo as well.
I think what I'm most frightened of now is...what happens if Neocate doesn't fix the problem? Is there a next step?