Cream together the butter, syrup, vanilla and salt until light, pale and fluffy
Melt the chocolate in 30 second increments in the microwave stirring in between each increment
Combine the melted chocolate into the butter mixture, mixing well
Chop up or crush the biscuits into small pieces and combine with the chocolate mixture, until all the biscuit pieces are fully coated
Grease and line an 8 inch round cake tin and pour the biscuit mixture. Then, place on a disc of baking paper and press down with a glass or mugPlace in the fridge for at least 30 - 60 minutes or till the cake has fully set Melt the chocolate in 30 second increments in the microwave stirring in between each increment, until smooth
Take the cake out of the tin and onto a serving plate and pour over the chocolate spreading evenly over the top and sides of the cake
Place the cake into the fridge for 30 mins until, the cake is fully set. Then, simply slice and serve