Preheat the oven to 200°C/180°C fan/400°F/gas mark 6. Line a 20 cm/8 in round cake tin with baking paper.
Stir the milk, vinegar and vanilla extract together in a jug. Set aside in the fridge
120 g (½ cup) unsweetened non-dairy milk (I use soy), 2 teaspoons vinegar, 3 teaspoons vanilla extract
Mix the flour, baking powder and salt together in a bowl. Add the cold butter and rub it in with your fingertips until it is mostly combined but a few pea sized lumps remain.
325 g (2 ¾ cups) plain (all-purpose) flour, 4 ½ teaspoons baking powder, ¼ teaspoon salt, 150 g (⅔ cup) vegan block butter
Stir in the sugar followed by the milk mixture to form a soft, sticky dough.
70 g (5 ½ Tablespoons) caster or granulated sugar
Scrape the dough out onto a floured surface and dust with more flour, pat out with floured hands into a rough oval shape.
Fold the oval in half, pat it out slightly again and fold in half again, repeat once more, dusting with more flour as needed. Be gentle and do not knead the dough.
Use your hands to pat the dough into a circle. Place the dough in the lined tin and gently press it out to fill the tin.
Bake for 25-30 mins until golden, firm to the touch and a skewer inserted into the centre comes out clean. Cool in the tin for 10 minutes then carefully turn it out onto a wire rack and leave to cool completely.