These are new from Marks and Spencer. They are designed to be chilled before eating (hence the name). Apparently there is a choice of two sets of flavours but the ones I've seen are chocolate, strawberry and lemon - a pack of six with two of each flavour.
I've only tried the strawberry as these are my sister's chocs, and it was very nice. However, the instructions seem unnecessarily complicated. You have to chill them for at least eight hours, then eat them within 15 minutes of removing them from the fridge, and they should not be re-chilled after being removed. Why? I've no idea. And while I've only tried one, I think it would be just as nice at room temperature.