Since one or two people were curious, this is what a pack of Nos looks like. I was commissioned to buy some today to celebrate my daughter's boyfriend's birthday. Here I am taking a break from marking and tea in the cafe afterwards. As you can see, the text and imagery on the package is very whipped-cream heavy, but they still put it in a discreet plastic bag.
I was wrong to say that you get 20 in a packet. As you can see, it's actually two dozen. Or, a score and four more.