We went to York Chocolate Story today. It's an exhibition in York that tells the story of chocolate. So its name really makes sense. Its also very good. We had a genial guide who talked us through the history of chocolate makers in the region.
Lots of names that were huge in chocolate and sweets were based around York. (My claim to fame is that for many years the laser marking machine that put datestamps on Kit-Kats was powered by software what I wrote).
Anyhoo, if you are looking for a well put together little tour and you fancy making your own chocolate bar, or you've got kids, I can strongly recommend it.