Thanks. I had read this but as you see, it says "released" and not recorded there. Check out this recording she did at Church Studios which seems like a very proper recording studio:
http://thechurchstudios.com/
21 was recorded in a bunch of different studios, but not XL’s one. “Rolling in the Deep” for instance was tracked as a demo at Paul Epworth’s studio, before being re-recorded with Rick Rubin in Malibu. However, everyone loved the rawness of the orginal demo, so Epworth moved to Eastcote Studios to “upgrade” the basic tracks, keeping Adele’s vocals from the demo, which ended up on the final track, mixed by Elmhirst at Metropolis’ Studio C.