Curly Wurly
Braided caramel in chocolate, and definitely bigger back then.
Cadbury's lattice of caramel, advertised by Terry Scott dressed as a schoolboy, and the subject of a national shrinkage conspiracy.
The bar has genuinely shrunk over the decades, which means for once the nostalgia is factually correct rather than a trick of childhood scale.
It was impossible to eat neatly and impossible to share fairly. The caramel pulled into threads that ended up on your jumper.
Cost back then
2p
Goes for now
About 60p