Put all these in a bowl or pan and microwave or heat on hob for a couple of mins, to melt:
- 100g butter/hard marg (not low-fat, as it won't set)
- 25g soft brown sugar
- 3 tbsp cocoa
- 4 tbsp golden syrup
- 225g crushed digestive biscuits
- 150g raisins
Press into a 20cm square greased tin.
Melt 225g milk/plain chocolate, pour on top and smooth over mixture (optional).
Mark into squares and chill in fridge for an hour or so before cutting.
Variation: Use chopped dried fruits such as apricots, glace cherries, cranberries, coconut, nuts etc instead of raisins if preferred. A mixture of a couple of these is particularly nice.