I've had more than a few LHR-IAH flights that used the gates right across from, or just next to, the Holideck. My last LHR-IAH was on the back side of T4 (close to the LHR Ring Rd), opposite the usual QF gates. Nice view of the A380, though, from Costa.

The new ST lounge sounds much nicer than the Holideck... Thanks for the update, OP! Anyone know if we can pay for one-time admission?