Sift the flour into a stand mixer bowl. Add the baking powder, sugar, xanthan gum, sunflower spread, coconut milk, orange juice & vanilla and mix together on a medium speed for a few minutes until the batter is smooth and silky

Stir in the orange zest and poppy seeds until evenly distributed

Pour into the lined tin and bake for 55 - 60 minutes until risen, pulled in from the sides of the tin and nicely domed. Insert a toothpick in the middle to test it's cooked through, it will come out clean when done

For the frosting, cream the icing sugar and butter together until pale and fluffy. Mix in the orange juice to thin the consistency then stir in the orange zest

Spread evenly on top decorate with some extra orange zest