dnw, thanks for the reply. I was aware that there is a Club House in EWR, and saw a picture of it on Virgin's website.
As far as the Revivals Lounge at LHR: Do I need to let one of the flight attendants know that I plan on using it? Is it on the airside, or landside; before or after security. Do I need to be escorted?
Thanks for your answers and time.