Line your baking tin with parchment paper and set aside for later.
Crush the rich tea biscuits into small crumbs leaving a few bigger pieces for texture.
300 g Rich Tea Biscuits
Melt butter, caster sugar, honey and cocoa powder over a medium heat or in a microwave until melted. Mix the mixture until combined.
180 g Unsalted Butter, 4 tbsp Honey, 3 tbsp Caster Sugar, 3 tbsp Cocoa Powder
Pour the crushed biscuits and chocolate raisins into the melted butter, honey, cocoa powder and sugar mixture until evenly distributed.
50 g Chocolate Raisins, 300 g Rich Tea Biscuits
Pour the tiffin mixture into a lined tin and press down with the back of a spoon until compressed.
Melt the white chocolate, milk chocolate and dark chocolate in different bowls. Spoon each chocolate on top of the tiffin mixture in different areas.
100 g Dark Chocolate, 100 g White Chocolate, 100 g Milk Chocolate
With a skewer or toothpick, swirl the chocolate to create a marbled look. Ensure the chocolate evenly coats all areas of the tiffin base. Watch the video to see how I did this.
Place the tiffin in the fridge and leave to cool for 2 hours or until the tiffin has hardened. Once chilled, cut into slices (I often cut mine into 16 slices or 9 big slices).