Gluten Free Flour

Self-raising flour - 
2 tablespoons potato flour plus enough white rice flour to make one cup,
1/2 teaspoon of baking soda
1/2 teaspoon cream of tartar
1    teaspoon of xanthan gum (or guar gum)

Plain flour - combinations include: two cups rice flour , two thirds cup potato flour and one third cup tapioca flour ; equal portions of soya flour and cornstarch ; equal portions of soya flour and potato flour ; equal portions of soya flour and rice flour .

Replace the role of gluten with xanthan gum or guar gum powders. These products are available from some coeliac societies and some supermarkets.