I voted for Charn, but, I am not certain. If this is just another scene in London I would not be opposed but, the amount of scenes in London kind of worries me since I usually assume that for the amount of scenes they will have to take out scenes out of Charn, Narnia, or the Wood Between the Worlds unless they want it to be a really long movie. They might cut the creation scene to be shorter or take out one of my favorite scenes just to keep adding these extra scenes. 

Overall, I would not be opposed to Digory praying for his mother or thanking God after his mum is healed as a scene, I just overly worry about extra scenes.

I don't think, from the photo, that it looks like the ruins of Charn at all; it looks like the interior of a medieval English church, of which there are quite a number in this country, funnily enough.  

Of course any scenes filmed there can be digitally modified afterwards to make it look dark and ruined and scary. But Charn also needs to look other-worldly — and I'd say that even if Jadis wasn't dressed like a character in a low budget sci-fi movie. I'm not quite convinced that this is the right location for it.

On the other hand, I can't think of much else it could be in the context of this particular story — unless, as Fantasia suggests, they're going to show Digory praying for his mother. But then Lewis stated at least once that he wanted the Narnia books to take Christianity out of those solemn settings of stained glass and hushed voices and so on. So I can't see that idea fitting with the story either.

In short, I haven't voted, because there isn't an option for "I really don't know"!!  

It's a lovely old church, but if it's going to be recognised as used in other productions, it would need to be a very small amount of time, or some different angles or parts of the church, for instance the undercroft/crypt (if there is one ). I don't think it will be Charn, but a part of the London scenes, as it's in the old City (the square mile), just a short walk north of St Pauls.

(In fact, if you walk north up St Martins Le Grand, you'll pass Gresham Street, but the buildings I've seen on that one are too modern to include it as an easter egg)

I could see it being used for ‘the hall of images’ in Charn. It also reminds me a lot of the outdoor architecture (the ruins) in Pauline Baynes pictures, so with a bit of dressing and VFX, I could see this even looking like outdoor Charn.

wouldn’t surprise me though if they visit a Cathedral in the course of Jadis rampage  - it may even be reminiscent to her of something she recognises from Charn.