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Similarly, you may ask, is plain flour and all purpose flour the same thing?
All-purpose flour is a mixture of bothhard and soft wheat and has from eight to eleven per cent of glutenand can be used for many popular recipes and is also known in manycountries as plain flour, so they are really synonyms.However, it should not be confused with self-raisingflour.
Also question is, what is plain flour used for?
White flour, otherwise known as plainflour, contains about 75 per cent of the wheat grain, with mostof the bran and wheat germ taken out. It is commonly usedfor cakes, pastries and biscuits. When used in cakes it iscombined with a raising agent such as baking powder or bicarbonateof soda.
Self-raising flour contains baking powderbut as baking powder will expire after a period of time you need touse up self-raising flour more quickly than plainflour. As a guide, Nigella uses 150g (1 cup) plain flourplus 2 teaspoons baking powder to replace self-raisingflour in recipes.