Melt butter, condensed milk, chocolate together in microwave. Stir together then add vanilla and cocoa, mix throughly.
Mix biscuit crumb and coconut in large bowl.
Add butter mix to biscuit crumb and mix together. Add dried berries and chocolate drops, mix.
Press firmly into an even layer in a lined slice tin.
ICING: Sift the icing sugar, cocoa, and salt into a mixing bowl.
Add melted butter and 1 Tbsp boiling water, and stir until smooth. Add more hot water if needed.
Spread out on top of the slice. Sprinkle with chocolate chips if desired.
Cover and refrigerate for at least 3 hours. Slices into pieces with a hot knife, and keep in fridge in an airtight container. It lasts for ages.