Preheat oven to 180C/350F. In a large bowl, mix together the plain flour, spelt flour, baking powder, sugar, salt and cinnamon.
1 ½ cups all purpose flour, 1 cup spelt flour, 1 tablespoon baking powder, 2 tablespoons soft light brown sugar, ½ teaspoon fine sea salt, ½ teaspoon ground cinnamon
Add the cold butter cubes and gently rub together until you are left with pea-sized pieces of butter.
5 tablespoons cold butter
Stir in the blood orange zest and the chocolate chunks.
2 blood oranges, 2 ounces dark chocolate
Add the lightly beaten egg (reserve a drop for brushing the tops) and the milk and bring together gently using your hands to form a dough, adding more milk if needed. You don't want the dough to be dry but you don't want it to be super sticky either. Pat the dough into a round, 1" thick.
1 large egg, 6-7 tablespoons milk
Cut into 8 wedges. Brush with the reserved beaten egg.
Place on a lined baking tray and bake for 15 minutes until risen and golden brown. Leave to cool a little before drizzling with glaze and serving.