Hi All!

I hate starting a new thread if not needed but have tried several different ways of wording my search but came up with nothing that answered directly to my question.

I have a flight to the states OSL-LHR-SFO in First, with a overnight stop at LHR, flight to SFO leaves at 14:00 next day, bags will be check through to destination. The question is, does anyone know how early I can pass security and enter the Concorde Room? I'd rather be there than sitting in my hotel room waiting.