Roald Dahl's widow: Charlie from Charlie and the Chocolate factory 'was originally black'

It is Roald Dahl day - when many schools across the country ask children to dress up as their favourite Dahl character and wear something yellow - the author's favourite colour.

Roald Dahl's widow Liccy told the Today programme why the celebrated writer became "grumpy" when he finished a book - and explained how Charlie Bucket from Charlie and the Chocolate Factory was originally meant to be black.