We went to this a couple of weeks ago and were really impressed.
For £7 the kids go off into a kitchen wearing net hats and aprons. They get to make a slab of chocolate with their choice of toppings and their name written on, and a marshmallow caterpillar, and get to choose a mold (DS1 chose a dinousaur) to shake their chocolate inside.
The chocolatiers drip chocolate into their mouths and were really friendly.
It's so slickly organised with their projects going in the freezer while they do the next bit. And they get to package it all up and put it in a nice brown bag to take out.
And you get to watch and take pictures from the cafe through the window.