• 225g/8oz plain flour • 350g/12 ½ oz caster sugar • 85g/3oz cocoa powder • 1 ½ tsp baking powder • 1 ½ tsp bicarbonate of soda • 2 free-range eggs • 250ml/9fl oz milk • 125ml. / 4 ½ fl oz vegetable oil • 2 tsp vanilla extract • 250ml/9fl oz boiling water