Place the milk chocolate, golden syrup and butter in a bowl and microwave on high for one minute. Stir well until all fully melted. Note: if the chocolate starts to seize, add a splash of milk and stir well. Leave to cool slightly.
Line a loaf tin with baking paper.
Place a layer of shortbread fingers in the base of the loaf tin.
Mix the Maltesers into the chocolate mixture.
Spoon two thirds of the Malteser chocolate mixture over the shortbread in the tin.
Smooth the top, then add a second layer of shortbread fingers.
Add the rest of the Malteser mixture over the top, smooth with a spoon or spatula, then top with the Mlteser buttons.
Transfer to the fridge and chill until set. This will take approximately 2-3 hours (depends on the strength of your fridge and the outside temperature etc).
Once solid, slice up into chunks and enjoy! Best stored in the fridge in a covered container, especially in hot weather.