This recipe is a cross between my scone recipe in my book and a recipe from Modern Practical Cookery published in 1932 .
It is better to use bread flour as I has more gluten which holds the scones well as they rise but plain flour will also work.
If you cannot buy baking powder then make some using bicarbonate of soda and cream of Tartar following the instructions in my hints and tips section.
It helps to pre heat a baking sheet for the scones to be placed on, they rise more quickly by doing this.