If I click on the links under "Similar programmes" on the above page, then the "Now and next" links, I would expect Bitter Lake to show up, but it doesn't. ("Now and next" under http://www.bbc.co.uk/programmes/genres/factual gives a 500 error, presumably because the search times out.)
I'm not suggesting iPlayer search would be a good way of finding programmes anyway, because most of the results would be for broadcast programmes. There are hundreds of ways of looking for broadcast programmes, but I want to separate out the online-only programmes. I wonder how many I've missed seeing already.
Other blog posts have been duplicated too, going back about a month, which you can see in the top pane of the screenshots. In each case, the original post was fine, but today's duplicate posts look horrible.
Another case in point is Radio 4's Inside Health and its sister programme, All in the Mind. I listen to the podcasts, and use RSS to notify me when new ones are available. Until April last year the programmes shared the same Web page and RSS feed. Then All in the Mind was split off, but I only realised that this week, and so I missed a year's worth of podcasts. A little note in the podcast's RSS feed could have alerted me.