Originally Posted by
Prospero
Sorry, I don't believe the Concorde Room is an option. Its necessary to have a F ticket for departure out of T4. Access to the First lounge is possible by virtue of oneworld rules.
While this is true, I don't believe it the only prerequisite. I believe that if you are connecting to a BA First flight later in the day (but are departing T4 e.g. in economy or business) you are entitled to access the Concorde Room.