Doctor who was the BBC Worldwide's best selling TV programme in 2010

"The top five individual TV series sold internationally by BBC Worldwide in the year to the end of March were Doctor Who series five, the debut series of Sherlock, the 15th and 16th series of Top Gear, and Human Planet.
The Doctor Who franchise made the biggest value leap last year with revenue climbing 49%, thanks to significant growth in the US. BBC Worldwide has seen a 45% increase in DVD and download-to-own sales, with Doctor Who the third-biggest seller in the US iTunes chart behind Mad Men and Glee.
Sales also increased in Europe, moving the revenue mix to 50% from outside the UK. In the previous year 70% of revenues had come from sales of Doctor Who DVDs and merchandise in its home market.
Overall the top TV brands by revenue – when sales of all series and programme titles are combined, not just for a single series – were Top Gear, Doctor Who and Waking the Dead.
BBC Worldwide's Facebook pages for Top Gear and The Stig now have more than 11 million fans, and around 25% of traffic to topgear.com now comes via Facebook."

Source:  The Guardian, 12th July 2011