Different emergency cake question - help

[assumetheposition]

Making DS's birthday cake.

6 oz of flour, sugar, butter
3 eggs

(2 tbsp cocoa)

but I've got no self raising flour!

How much baking powder to put in? Do I need bicarb too?

1 tsp but i am not a scientific caker.

Was also going to say 1tsp. I'm sure it's 1 tsp for up to 8oz flour.

I would use a teaspoon of baking powder - no bicarb, or you could use bicarb and cream of tartar instead, 3/4 of a teaspoon of each.

Thanks will go with 1tsp and see how it goes.

I have cream of tartar in the cupboard and have never known what it was for

Making playdough! That's all I ever use it for.

To convert plain flour into self-raising flour, add two teaspoons of baking powder to each cup of plain flour. Adding one teaspoon of cream of tartar and half a teaspoon of bicarbonate of soda to one cup of plain flour gives the same result.

I use cream of tartar and bicarb when a recipe calls for a lot of baking powder (have a muffin recipe that asks for 3 tsp) as I find a lot gives the cakes a funny feeling when you eat them - the bicarb/tartar mix doesn't do this.