I only ever had these once in the late 90s and have never found them online or in any of the many sweetie shops I've visited since.
They were white chocolate pyramids but the pointy bit was flattened off. Filled with a dark chocolate mousse type thing. You got them in those sweetie jars that they would weigh out 100g or so.
No one i speak to in real life remembers them either. I can remember thinking they were gorgeous but i expect they would be sickly disappointment now. I would still like to find some, just to check