The Missing Forth Episode

According to this 2014-05-08 article:

http://www.david-tennant-news.com/blog/episode-4-real-history-science- fiction-will-air-till-later-year/

"It has been confirmed by BBC America that episode 4 of the sci-fi series, The Real History of Science Fiction featuring David Tennant and Steven Moffatt, will not air till later this year, a date yet to be confirmed. The first three episodes of the series have already aired but episode 4 will not be shown at this time."

The above was the important bit, as the rest of the short article concludes with a description of the mini-series.

Evidently, BBC America doesn't care if you took the time to watch three of the four episodes. It had to be "confirmed", which means someone had to ask them. Otherwise, they wouldn't have said anything. Regardless if stations have the right to make last minute changes, IMO the BBC America decision to not finish the planned four consecutive weekend airing of the mini-series, after airing three episodes on schedule and then abruptly stopping without as much as a courtesy peep on the BBC America website -- illustrates a lack of professionalism.