Sift together flour, sugar, baking powder, and salt in a large bowl.

Cut in shortening and butter using a pastry blender or your fingers until the mixture resembles coarse crumbs.

Mix in oats and currants.

Add milk and mix until just combined; do not overmix.

Turn dough out onto a lightly floured surface and gently knead 5 times.

Roll the dough into a 6-7 inch circle.

Brush the dough with melted butter.

Sprinkle the dough with a mixture of sugar and cinnamon.

Cut the circle into 6 pie-shaped wedges.

Place the wedges on an ungreased cookie sheet.

Bake in a preheated oven at 375°F (190°C) for approximately 15 minutes, or until golden brown.

Serve warm with clotted cream or marmalade.