1½ tsp baking powder
1½ tsp bicarbonate of soda
350²µ/12½´Ç³ú caster sugar
85g/3oz cocoa powder
225g/8oz plain flour
2 tsp vanilla extract
125ml/4½fl oz vegetable oil
200g/7oz plain chocolate
200ml/7fl oz double cream
2 free-range eggs
250ml/9fl oz milk