This is the yummy scrummy soft sweet stuff that is in various chocolate bars. Not the American crap chocolate, the proper British stuff that actually tastes of chocolate.
Cadbury's is the best British chocolate manufacturer.
The best example of this is the Cadbury's Double Decker chocolate bar. The chocolate bar is lightly flavoured with coffee and structured in two layers; an upper whipped nougat layer (yummy), with a lower layer of cereal ‘crispies’, these are then coated in milk chocolate.