Having Steven Moffat back writing new scripts for the show was certainly a surprise, and many think his very best Doctor Who work was under RTD’s stewardship, so expectations were high. It’s a signature Moffat conceit, taking one idea and making it work for the entire run-time. Here I think he’s very successful, on the whole. There are countless developments, revelations, raisings of the stakes and they pretty much all come off. You can tell listening to the commentary how pleased he is with the twist of Ruby getting felled by friendly fire and, fair enough, it’s brilliant.

Ncuti Gatwa continues to just do exceptional work here. He really is the Doctor now, and is pulling off that oh-so-difficult trick of being exactly the same character and yet totally different from any of his predecessors. But there are niggles. Firstly, it’s the benevolent-automated-system-run-amuck yet again. True, these are set up in the opening, rather than being the final hopefully-devastating revelation. And, yes, the added wrinkle that it’s all part of the same capitalistic warmongering plan as the mines themselves feels fresh (apart from a tiny whiff of familiarity from The Doctor’s Daughter). But we had SO MANY of these devices in the Eccleston/Tennant/Smith days (The Doctor Dances, The Girl in the Fireplace, Silence in the Library, The Lodger, The Girl Who Waited, The Curse of the Black Spot, and probably more besides) that one of the saving graces of Chibnall’s run was I really thought we’d seen the last of them. But, no, here it is again with its placating catchphrases and serenely beaming countenance.

Then there’s the fact that very small cast, who all pretty terrific, are not all used to full capacity. In particular, not only is Ruby out cold and playing no part in the climax, Carson does a lot of standing around saying nothing after he’s nobbled Ruby, and Splice is just told to watch a slide show and shut up. Add to this, the fact that – out of necessity – the craterous warzone has been created entirely in the studio, and the ambulances look like the cleaners out of Paradise Towers, and we might be heading to near miss territory here.

What brings us back is the strong playing of the cast – who’d have guessed we’d be seeing next year’s companion this early? – the very effective ramping up of tension and some amazing moments, like the rock-hard Doctor taking three blasts to the right hand and not even flinching. I even didn’t mind the reprise of the Anglican Marines, which to me landed like world-building and not like “oh this again”, but if I’d not been enjoying the rest of the story so much, maybe that would have grated too.

So, it’s a terrific premise, handled with skill and style, brilliantly played by an incredible cast. But it looks a bit cheap, and some of the parts so cleverly assembled are a trifle shopworn and over-familiar. However, it’s very entertaining stuff, and crucially, we’re seeing the format stretched again which is all to the good. I loved the tone of the ending too. Four stars.

So… what did I think of Space Babies and The Devil’s Chord?
So... what did I think of 73 Yards?