http://www.telegraph.co.uk/foodanddrink/recipes/8737895/Mary-Berrys-Devonshire-scones-recipe.html
Excerpt:
“The secret to good scones is not to handle them too much before baking, and to make the mixture on the wet, sticky side. Put the flour and baking powder into a bowl. Add the butter and rub it in until the mixture resembles fine breadcrumbs. Stir in the sugar.”