Another vote for Emma and Pip at Northcote Chiropractic.
Before becoming a nanny I worked at a specialist paediatric chiropractic clinic (not in London unfortunately). We found that Chiropractic really helped with a whole array of ailments, and once miserable babies would come back all smiles!
We found that allergies and intolerances also played a massive part, and always advised the mums to seek expert nutritional advice to put into place alongside treatment.
I can only speak from a chiropractic background, but I've heard that osteopathy can also work wonders.