Very good point - I didn't think about that. So I will need to get a boarding pass before going into the FCC I guess? That could be a hassle as I will have to get that at T3 check in - that means going landside to T3 check in and then back through security.
I am departing a UK regional airport that morning so I might be able to get the BA (well Servisair......steady) staff there to issue me with a boarding pass (sby) for a BA LHR-LAX flight and then use that to get through. Problem is though that the BA flights leave from T1 so I could get into T1 through the FCC but could I get over to T3 that way as I won't hold a boarding pass for a flight departing from T3 till I actually get there if you see what I mean!
Great tip though - that would have been a waste of time as I would have had to queue up for ages only to get sent back to check in!!
Thanks spanishflea