Hm, on the Skyteam website, under "Virgin Atlantic Clubhouse London Heathrow", it says access is available for "international First or Business Class ticket holders or SkyTeam Elite Plus Frequent Flyers traveling on an international flight operated by the following airlines: Virgin, Delta & AeroMexico." So according to that statement, anyone with Elite+ status traveling in Y on either three airlines should technically be able to get into the lounge....