Grease and line a 16 x 26 cm tin with baking parchment.

In a large saucepan, melt the butter, cocoa and syrup together. Remove from the heat and stir in the chopped digestive biscuits and apricots. Then lightly stir in the Oreo Pieces.

Spoon the mixture into the prepared tin and press down, smoothing the surface with a spoon.

Melt both the chocolates together in a bowl over a saucepan of simmering water. When melted, stir together and pour over the biscuit mixture, using a knife to spread the chocolate to completely cover the surface.

Roughly chop the Crunchie bars into pieces and sprinkle over the melted chocolate. Cover the surface of the tray with cling film and refrigerate for about 2 hours to set. Cut into pieces just before serving. This is quite a rich treat, so don’t cut large pieces.