In a saucepan melt 250g/8oz butter and 4tbsps of golden syrup (or brown sugar/honey if you don't have syrup!). When it's melted take the pan off the heat and break up 400g/14oz dark chocolate into the saucepan. Stir it all up.
Then crush up 450g/160z digestives (this usually works out as just less than one of those big packets so you can eat the few left over!!) and add them to the chocolate mix.
Then add 200g/7-8 oz of a mixture of the following:
nuts, raisins, glace cherries, dried mango, dried cranberries, coconut, dried apricots, dried apple, dried pineapple, glace ginger, mini marshmallows etc. Experiment with different mixes.
Smush that all into a silicone baking tray (or a greased normal baking tray if you don't have one of those)
Gently melt another 400g chocolate in the pan and pour this on top of the mixture. Smooth it out. You can even put little marbling effects in with white chocolate if you're keen).
Put in the fridge until it all sets. When it's hard, take it out of the fridge fro twenty mintues then slice into pieces. You can put these in a tin and store in the fridge for as long as you can hide it from yourself!