Fisher Priceless

So it looks like this whole series of Doctor Who is made up of two-parters with matching titles? I approve - a nice throwback to the original series without actually going back to four- and six-part stories that spent the middle bit running around corridors because they ran out of story. And the tenth anniversary of the new series is a good time to go for it. But I can't have read the series preview in the Radio Times that carefully because I totally missed that this was what they were doing.

"Under the Lake" / "Before the Flood" by Toby Whithouse, directed by Daniel O'Hara. Spoilers after the cut.