Lightly crush the digestive biscuits, chop the marshmallows in half or quarters and chop the Maltesers into halves, quarters and leave some whole. (Roughly chop).
In a large bowl place the broken digestive biscuits, chopped marshmallows and Maltesers and mix.
Melt the butter, golden syrup and Caramilk chocolate together and pour through the the rest of the ingredients. Mix quickly and press into the prepared tin in an even layer.
Place in the fridge for one or two hours until set. Cut with a sharp knife into pieces and serve.