Virgin's Blue Rooms

I heard that there are airport lounges available through Virgin. This would be a consideration for travelling although I don't know how they rate compared to the other dedicated airline lounges or what the cost is. What sorts of facilities do they offer and does anyone know whether they are comparable? Priority pass also have a network of lounges available and other benefits. It is hard to get decent information on the full extent of lounges available on these sites and what the costs of entry to and use of facilities are without having to call their customer service teams. Anybody know of a decent site where this info. is available rather than just relying on the main sites.