Potato salad

potato 68.0% , rapeseed oil 12.0% , water 11.0% , onion 5.5% , double cream 2.8% , white wine vinegar 1.4% , spring onion 2.0% , sugar 0.0% , whole egg 0.0% , spirit vinegar 0.0% , chives 0.0% , salt 0.0% , parsley 0.0% , corn flour 0.0% , egg yolk powder 0.0% , Preservative 0.0% , mustard 0.0% , flavouring 0.0% , hydrogenated fat 0.0%