I popped in there today. I noted that announcements in the escalator area (welcome, safety, etc.) referred to Warburton. Even with my poor hearing, I found them relatively clear. I have no idea if the voice was a computer one or real human, and if the latter whether pre-recorded or live. It was an American accent.
I also noted that, like the Bakerl0.0 campaign a few weeks ago, as far as I can tell all the proper roundels are still in place and unobstructed. The novelty name signs are in poster spaces so technically are 'just adverts' (albeit I think line diagrams and that kind of thing rather than another insurance or makeup company).