Dr Adam Fox at St Thomas' is brilliant, one of the best paediatric allergy specialists in the country - I think he sees patients privately at the Portland. I paid for a private appointment with him for my 7 month old son (less than a week's wait and worth every penny to get a clear diagnosis and action plan as we were having a nightmare weaning my son). Once the NHS appointment came through, my son then saw Dr Fox every year on the NHS at St Thomas' until he outgrew his allergy. Good luck and hope you get a diagnosis soon.