For the first time, I've just switched over to it - and guess what? Recorded output. Although, two things of note. 1 - its repeated original news content. 2 - there is a dog in the top right hand corner saying 'REC'.
However, there is a two shot interview being shown, with a wider view out of the windows looking out to a plaza and another set of buildings across the way. It looks like those buildings either on Stockley Park (where IMG are now based) or down in Chiswick, where Ericcson Transmission are.
Having pondered where they are now based (presumably for another few days before the plug is pulled again) back to Sky News...
"Occasionally it gives us something good, but for the most part, it is pathetic and puerile". Lord Taylor, House Of Commons, 1959.