Friends - If I ate a bar of choc,bar of white choc,568ml of double cream,8tbs of caster sugar and 2?

No, but it would be quite a lot of calories (all sugars and fats with a little carbohydrate), your body would be unable to use all of that energy in a day even if you were an athlete. Once will do you no harm but if you make it a regular thing and do nothing to mitigate the extra calories you will put on weight quite quickly.