Originally Posted by
CarmenOM
As DL Plat you should have access to the VS arrivals lounge (called Revivals) in Terminal 3, but you would have to exit security to do so. It isn’t open all day, just until 1 or 2pm. I don’t know the logistics involved in connecting from DL arrival in Terminal 3 to a 9W departure, which I think is Terminal 4, and how the lounge visit would work with the connection.
Logistics involve taking a bus from T3 to T4 and re-clearning security there -- which you wouldn't be able to do if you entered the UK (and visited the Revivals lounge). You'd need several hours for this, and then you'd need to go down to the train station to catch the shuttle train from T3 to T4. Not worth it, IMO -- going airside at LHR if you have to change terminals is a pain.
Regarding T4, from which 9W departs: if you have Priority Pass you can use the SkyTeam Lounge at T4 (which isn't half bad) or the Plaza Premium lounge, but your ticket won't get you anything.