Grease and line your cake tin, leaving enough overhang to help get the slice out once its set.
Lightly crush the biscuits into a range of sizes. Roughtly chop the almonds. Add the crushed biscuits into a bowl with the coconut and almonds. Sift in the cocoa powder and mix well.
Melt the condensed milk and butter together in a microwave proof jug in the microwave. Mix well.
Add the condensed milk and butter to the dry ingredients and mix well. Tip into the lined cake tin and smooth down until the mix is evenly spread out in the tin and flat.
Chop the chocolate into small pieces. Add the chocolate and neutral oil to a microwave-proof bowl. Melt in the microwave for 30 second to one minuit bursts until melted.
Mix well, then tip the melted chocolate onto the slice and spread evently. Gently tap the tin a few times on the bench to help get out any air bubbles.
Put in the fridge for two the three hours to set.
Use the overhanging baking paper to remove the slice from the tin, the cut into pieces with a large sharp knife.