[Flux]

And indeed I saw a green screen pre-rec. The presenter and prop were being chroma-keyed and it's sort of noticeable with fast movement. i.imgur.com 

The use of the previous HQ set as a backdrop seems to indicate this is temporary. If they were moving to green screen permanently you’d expect new, custom made backdrops. I doubt they’re going back to that set (built in a new studio) but at least using that set as a backdrop means there’s consistency in the interim and presumably keeps the number of on screen changes minimal.

Or, of course, they just see no point introducing a whole new studio look since all in vision continuity is due to be phased out as the linear channel closes, meaning this is it for the last year or so.