What is the best shampoo to use for Blonde fine hair?

Pro Naturals by far

The best combination I have found that effectively works is on blond fine hair is VitaAmazônia™'s Expresso Coffee Milk Shampoo enhanced with the application of VitaAmazônia™'s Intensive Colour Blonde Mask. The former is salt free, which prevents the hair drying out and giving it natural vitality, contains milk protein and is ideal for fine, dull and tired hair. The latter is made up of a specially formulated oat and milk complex, making it ideal for all blond hair types and leaving the hair tangibly moisturised, emollient, with the natural colour brightened and shinier.
These products are available from my website and are competitively priced at £22.00 for the 500ml flask of the shampoo and £13.05 for the 200ml flask of the mask, both exclusive of packaging/ postage.