I wonder if the kitchen sink episode may have been combined with the historical / period drama one? I heard not many were coming in for Kitchen sink, whether this continued to be the case or not I don't know, but I would imagine a lot of those submissions could be recategorised as historical pieces, or at the very least would fit with the tone of them in the same episode.
Still holding out hope for a documentary rewrite, especially one about a particularly bland brummie presenter