Preheat the oven to 180°C
Line 2 x 7 inch / 18cm sandwich tins with baking parchment; cut two circular pieces of baking parchment to the same size as the base of the tins, oil the inside of the tins, place the paper in the bottom of each tin, oil the tins again (inside edges too).
Put the plant milk and lemon juice in a jug and allow the lemon juice to curdle the milk (this is basically creating a sort of plant buttermilk). The milk should only take about 20 seconds to curdle (separate).
In the same jug, add the vanilla extract, sunflower oil and melted coconut oil.
Sift the self raising flour, bicarbonate of soda and caster sugar into the a large mixing bowl.
Stir in the desiccated coconut until well combined.
Stir in the wet ingredients from the jug (making sure it is all well mixed and there are no patches of dry flour remaining).
Divide the cake mixture equally between the two sandwich tins and place in the centre of your preheated oven for around 18-20 minutes. The cake will be cooked when it is risen, golden and feels slightly springy to the touch. You may also notice some wrinkles around the edges and see the edge of each cake coming away from the side of the pan.
Once you have removed them from the oven, allow the cakes to stand in their tins for 5 minutes before transferring to a wire rack to cool completely.