Preheat the oven to 180°C (350°F).
Line a loaf tin (approximately 13cm x 23cm) with baking paper and spray with non-stick spray.
In a medium bowl, sift together the flour, baking soda, baking powder, and salt.
In a separate bowl, use a mixer to blend the eggs, sugar, softened butter, vanilla essence, lemon zest, and lemon juice until smooth
Gradually add the wet mixture to the dry ingredients, mixing carefully until fully combined.
Stir in the coconut oil and mix well.
Pour the batter into the prepared loaf tin and smooth the top.