I'm flying Virgin Atlantic UC IAD/LHR and back on 4th/18th September and I can guest 1 at Dulles on the 4th or 1 at Heathrow on the 18th, anybody flying alone who was not quite as fortunate? Providing you are dressed appropriately I'd be happy to guest you into the lounges. I'm on VS022 on the 4th and VS021 on the 18th.
Happy travels!