Thread:Titan95/@comment-27969955-20160610124018/@comment-25050081-20160610124506

"What Lies Beneath" is the 1000th - I know I was confused as well! Basically all media outlets (including the BBC) have dubbed the episode airing on the 26th ("History Repeating") as the 1000th episode, but it's actually the 999th. The BBC publicist confirmed that the 1000th would be airing on 2 July too.

I presume the cause of this error is that there's no episode on the weekend of Saturday the 18th, and if there were then the episode airing on the 26th would be the 1000th.