Milk chocolate mousse with ganache

Milk chocolate 40% (sugar, cocoa butter, whole _milk_ powder, cocoa mass, emulsifier (_soya_ lecithin), natural flavouring), whipping cream (_milk_), pasteurised _egg_ white, pasteurised _egg_ yolk, salted butter (butter (_milk_), salt), whole _milk_, dark chocolate 6% (cocoa mass, sugar, fat reduced cocoa powder, emulsifier (_soya_ lecithin)), sugar, glucose syrup, stabilisers (guar gum, xanthan gum), preservative (potassium sorbate), fat reduced cocoa powder, acidity regulator (citric acid), water.