DH's family have all had eczema all their lives (as did his mother ) and while dairy makes no difference to him, the sisters in law found cutting out dairy did help. It is a common "irritant".
DH would also agree about Betnovate only being used vary sparingly and certainly not on a 2 year-old. Steroid use has definitely thinned his skin over the years and it cracks and bleed very easily. Sometimes doctors can be too ready to prescribe steroids as they do work in the short term, but at a price.
BTW the emollients DD uses to wash Toby in are Aqueous cream or Emulsifying ointment.
As I see it, it needs a 2 pronged reaction -
1) find out if possible what has provoked the current outbreak and remove if possible at source and
2) look for what will soothe and ease the itching (because that is when there is risk of infection) and calm it down. It may last a life time or a child can grow out of it, the main thing is not to provoke an outbreak by some of the (modern) products curently in general use .