The TBIT lounge opened on Friday. Still no buffet or business services, but the bar is open and no crowds at 15:00 on a Sunday. It is at gate 151. The entrance is closer to the center of the terminal, so don't take the moving walkway.

I would post a photo but FT is still not allowing photo uploads from Android devices (freezes at 90%, which has been an issue for me for a long time, on multiple devices and browsers)