Preheat oven to gas 4 / 180C / 350°F and grease and line a 9 inch tray
Combine flour, 1st lot of baking powder and salt in one bowl.
In another mix both sugars and dairy free spread and beat well
Mix water, oil and 2nd lot of baking powder together until light and creamy them add vanilla
Add to sugar mix, then add all to flour mix and beat until well blended
Pour the mixture into the tin and bake for 30 - 40 minutes until light golden brown
Cool in tin for 15 minutes then slice and let cool completely