Gluten and Dairy free choc cake

Ingredients
230g Plain Doves Gluten Free flour
1 tsp Baking Powder
1/2 tsp Bicarbonate of Soda
200g Caster Sugar
130g Light Brown Sugar
75g Cocoa Powder (I used Callebaut)
160g Water
140g Vegetable Oil
3 Lg Eggs
1 tsp Vanilla
3 tbsp Buttermilk ( 3tbsp soya milk and 1/4 tsp lemon juice, wait 10 mins to curdle)
1/2tsp Coffee powder
100g Melted cooled 811 Dark Callebaut **Chocolate
Buttercream
250g Vegan Block Butter Unsalted ( I used Flora Vegan Block)
500g Icing Sugar
1tsp vanilla extract
Ganache ( 100g 811 choc and 30g Soya Milk)**
70g Cocoa Powder
This chocolate has no milk in the ingredients but is made in a factory so does state MAY contain