I am flying BA F into LHR T5, and then out BA from T3. I have three hours at the airport. I understand that I can stay airside to transfer between terminals.

However, is it possible and advisable to disembark, visit the Concorde Room in T5 (just to say I've been there!), and then back-track to the airside bus to terminal 3? Will I have enough time to do all of that, or should I just spend my time in the F lounge in T3?