Used BA's Concorde Room (CCR) at T5 LHR, have used BA business lounge - not great; busier than Piccadilly Circus, full, noisy, dirty. My favourite is Virgin's Clubhouse at LHR T3, IMO it is much nicer than the CCR, just fresher and brighter. The CCR is very nice, but I just get the overall impression it's a little 'tired'. A number of years ago, I paid to use a 'lounge' at LHR. Oh my, never again. Dreadful.