According to the OW site the F galleries is available to OWE regardless of travel class. Concorde Room is for F pax only though.
Thanks nglagalle, first trip must have been spending some time in the Concorde room with partner guessed in- they wouldn't let us in 2nd time as only travelling J. Thanks for the correction - must try out the Concorde room again, it was truly amazing.
As I said before, both the J and F lounge in T5 are streakes ahead of the offerings in T3 - BA probably wants to maintain T5z as their centre piece.