Preheat the oven to 425 degrees F. Line a baking sheet with parchment.
In a mixing bowl, stir together the flour, baking powder, baking soda, salt, sugar, cinnamon, nutmeg, allspice and ginger.
In another bowl, stir together the pumpkin, milk and egg.
Slowly add the dry ingredients to the wet ingredients. Fold in the cranberries.
Turn the dough out onto a lightly floured work surface. Pat the dough into an 8-inch circle.
Cut the dough into 8 wedges.
Place the wedges onto the prepared baking sheet. Bake for 12-15 minutes or until golden brown.
Remove from the oven and after a minute, transfer to a cooling rack.
TO MAKE THE GLAZE
In a small bowl, whisk together the powdered sugar, cinnamon and milk until smooth. The glaze should have enough liquid in it to drizzle onto the scones so add a little more milk if needed, a half a teaspoon at a time.
When the scones have cooled, drizzle the glaze over the tops.