Ah, that was great - Suranne Jones more than made up for being so shit in SJA by being so fantastic here!
Lots of lovely continuity nods made the whole thing feel lovely and comfortably familiar - which reminds me - hey, a living planet, I thought I was the only one knocking off the B7 episode Trial this year. Oh, and, look, when you put a TARDIS sentience in a human body it goes crazy and dies! Who'd have thought that?! Well, five years late...
The TARDIS corridors looked more like Liberator corridors to me, but what the hell. It did seem a bit of an easy con to get rid of House, so that stops it getting a full 10, but overall this kicks the crap out of the past three episodes. Best episode since Vincent And The Doctor and confirms a lot of what many of us have felt/observed about the Doctor/TARDIS relationship for years
Some holes though - most of all who was Idris at the start? I mean it's convenient there was one normal human body on the entire planet...
Arc speculation - "the only water in the forest is the river" has to be a reference to River's death(ish) in Forest Of The Dead. Is the Doctor going to undo that somehow, perhaps as part of preventing his own death? Or is he going to be "saved" in the library or ghosted?
9/10
As for next week... Hm, clones/avatars in armour that looks rather Sontaran-derived... But the line about needing the original to keep them stable matches the Zygon duplication process better. I wonder if either species will appear?