Help with scones!

[Castlelough]

I'm following a Mary Berry recipe.
I've measured out everything for the recipe, but I was wondering about the self raising flour.
Should I sieve it?
It doesn't say in the recipe. It just says to mix with baking powder in a bowl...but maybe it's a given that it should be sieves first?

Meant to say, a key thing is to put egg into measuring jug and then top up it 150ml with milk. If you start with 150ml milk it's too much and the mixture gets runny. Most eggs are around 40-50ml when added.

I don't use eggs.