Maybe not aired since 2011 because it's filed under Dan Dare!
This is a snafu from when Dan Dare was last aired. I think they tried to use a DD page as a template for the Xmas ed. of Lyons. Its been there for at least a year. A minor snafu compared to the numerous truncations due to mis-timings that happen on iPlayer almost daily.
As has been commented on here many times the automatic capping of various streams of radio programmes from Radio 4X and others sometimes is out of sync. so the beginning or ending of a file on iPlayer is truncated. Then a complaint has to be made to the Beeb, after which the streams are re-capped with the correct timing. It happens all of the time. TV programmes seems to OK. Its Radio that the problems are with.