I assume you're making the dough in advance to save time in the morning. I don't think this dough will give you the same results if you try and hold it. It looks like the leavening comes from the chemical reaction between the milk and the baking powder. I suspect it'll lose a lot of umph in the fridge. It's not like yeast which will slow down in the cold. Yeast slows down because it is a biological process. This leavening is a chemical reaction that I don't think will slow.
You could, of course, mix the dry ingredients in one bowl, mix the wet ingredients in another bowl. Refrigetate the wet ones and then combine them in the morning just before baking. Then the reaction would be fresh and the scones will rise just fine.
"The only thing I have to eat is Yoo-hoo and Cocoa puffs so if you want anything else, you have to bring it with you."