For the lack of a comma

From the BBC News site today:

"Ms Benn, granddaughter of Tony Benn and Labour's youngest candidate" [Ms. Benn is 20 years old].

Shades of the traditional "To my parents, Ayn Rand and God". There are good reasons for the serial comma (sometimes called the Oxford or Harvard comma). Most times it can indeed be left out, but when it is needed it is really significant.