'Sherlock' set a new record for iPlayer use

"New Year’s Day saw the much anticipated return of Benedict Cumberbatch reprising his role as Sherlock Holmes in the first episode of the second season of Sherlock. Looking at the total visits to iPlayer on 2 January there were 4.3 million visits from UK Internet users, a new record for iPlayer."

Source:  Data from Hitwise, reported on their blog, 6th January 2012