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Heat the oven to 180C/160C fan/gas 5. Butter and line a 30 x 20cm tin. Put the butter and sugars in a mixing bowl and beat using an electric whisk until light and fluffy. Add the vanilla and almond extracts and orange zest. Mix to combine.
Add the eggs one by one. After each egg, make sure to whisk fast to avoid any splitting. Add the flour and baking powder and whisk for 2 mins until you have smooth batter. Fold in the milk. Spoon the mixture into the prepared tin and bake on the middle shelf for 25-30 mins until a skewer inserted into the middle comes out clean. Leave the cake to cool in the tin for 10 mins, then transfer to a cooling rack until cooled completely.
Meanwhile, make the ganache. Put the chopped white chocolate in a large heatproof bowl. Bring the cream to a boil in a small saucepan, then immediately pour it over the chocolate. Leave for 1 min to melt. Whisk the cream and melted chocolate until you have a smooth, ganache mixture. Set aside – it’ll thicken as it cools.
Spread the ganache on top of the cooled sponge in an even layer using a palette knife. Roughly break up the biscuits, then scatter them evenly over the cake. Cut into 12 squares.