Aw crap, my fears were justified.
Ingredients
200g (1 cup, firmly packed) brown sugar
185ml (3/4 cup) milk
125g butter, chopped
115g (3/4 cup) self-raising flour
75g (1/2 cup) plain flour
50g (1/2 cup) cocoa powder
3 eggs, lightly whisked
185g butter, extra, at room temperature
345g (2 1/4 cups) icing sugar mixture
95g (3/4 cup) malted milk powder
1 tablespoon milk, extra
465g Maltesers
Ganache
300g dark cooking chocolate, finely chopped
125ml (1/2 cup) thickened cream
30g butter