The Sibelius music notation program has this theme on their installation disk. Here is the reference to their website Mr Bean
That theme was written by Howard Goodall who also wrote the book, Big Bangs
(1999, 2001). This book, a slight rewriting of the script of a TV series Goodall did for British television, discusses what he considers the five most important, most influential moments (developments, inventions) in music history, the five moments that made western music what it is. The TV series entitled Howard Goodall's Big Bangs
is currently available on DVD.