Tim Marlow on Constable: The Great Landscapes Five, 7.15pm

Another chance to see Tim Marlow's guided tour of the current Tate Britain exhibition and to reassess the work of one of England's greatest painters. Unfortunately, Constable still has the taint of the chocolate box about him. Turner is the cool one, the wild and experimental romantic, but his contemporary remains a more interesting artist than his grand canvases sometimes suggest. These days it's easier to find more of interest in his more fluid sketches and rough work, but even in his more fully worked paintings there's always something of interest. Usually the sky. He does great skies.

The Perfect Disaster Five, 8pm And talking of skies . . . Here's another CGI-fuelled docudrama that examines what would happen if a super tornado one-and-a-half miles wide and reaching speeds of more than 350mph, were to hit Dallas in the United States. This may be jumping to conclusions, but nothing good, I'd imagine.

Speak No Evil: The Story of the Broadcast Ban BBC2, 11.20pm In 1988 the Conservative government of the time, in an attempt to deny Irish Republicanism "the oxygen of publicity", bizarrely decided to stop British television programmes broadcasting the voices of the leaders of Sinn Fein. Broadcasters got around the ban by hiring actors to impersonate the likes of Gerry Adams over footage of him speaking. Francis Welch's film offers an amusing footnote to a curious moment in British and Irish politics. Speak No Evil, you will probably not be surprised to learn, first appeared on BBC4. Does the fact that many of the best things that appear on the second channel seem to originate from its digital sister suggest that BBC2 needs to raise its own game? Just a thought.