Chewy sweets made exclusively for Marks and Spencers, which (sadly) probably limits them to the UK. However, given their properties, I wouldn't be surprised if they turned out to be a banned export.

They're lemon flavoured gummy things .. coated with a 'fizzy' layer of sparkly dust. They are wonderfully sour .. but be warned eating a whole packet will result in a Lisa Simpson style "I can see through time!" moment. The roof of your mouth will collapse, and you will lose all control of your jaw.

Contrast with Percy Pigs and Jelly Sharks.