It is a type of flour with a particularly low gluten and protein content. As it is not available it the UK, the best substitute is a cup of plain flour with 2 tbl cornflour added (using this ratio of flour:cornflour to replace the quantity of cake four in the recipe).
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One cup of All-Purpose flour. Remove 2 tbsp of the flour and replace with 2 tbsp of cornstarch. Sift about 5 times to combine well.
In most cases Self Raising four is used in cakes, this is the substance that makes the cake rise. Plain flour is generally used in biscuits and things that don't need rising.