Vegan blueberry scones

Name: Vegan blueberry scones
Prep time: 20 min
Cook time: 23 min
Total time: 43 min
Cuisine: British
Ingredients: 250 g / 2 cups all purpose white wheat flour or GF plain flour (I use this one); ¾ tsp xantham gum (for GF version only); 9 g / 1 tbsp baking powder; ¼ tsp fine salt; 100 g / ½ cup caster sugar or coconut sugar; ½ tsp freshly ground cardamom (optional); zest of 1 lemon; 60 g / 2.1 oz vegan butter; 140 g / 1 cup blueberries, fresh (or frozen); 135 ml / ½ cup + 1 tbsp plant milk; 15 ml / 1 tbsp plant milk; 15 ml / 1 tbsp maple syrup; demerara sugar or coconut sugar, to sprinkle (optional)