I found it! The easiest, quickest cake I’ve ever made, you only have to weigh and layer the ingredients.
150 g/ 5.3 oz butter
250 g/ 8.8 oz butter biscuits (Leibnitz, I prefer the whole wheat version)
100 g/ 3.5 oz unsweetened coconut flakes
200 g/ 7 oz chocolate chips or roughly chopped chocolate of choice (not too sweet)
200 g/ 7 oz almonds or other nuts
200 g/ 7 oz heavy cream
250 g/ 8.8 oz unsweetened condensed milk (4% fat)