Swapping plain v. self-raising flour

[barryman]

Where a bread or cake recipe states using plain flour AND baking powder, is it a safe bet to substitute self-raising flour with no baking powder.
On a general note how interchangeable are the two flours??

 

[chassis]

I wouldn't interchange. What is the motivation to consider deviating from the recipe?

 

[barryman]

If I've run out of plain flour !! As an emergency substitute, will it work ok??

 

[chassis]

It's hard to say. Do you know the precise quantity of leavening the "self raising" flour contains? It's a gamble. If the final product result is not critical then try it. I would procure and use the proper ingredients.