OLCI is turned off on BA for many (most?) routes outside the CTA. This is being reviewed route by route since it depends a bit on the local interpretations of restrictions. Those locations with MMB documentation checks such as Greece should be OK for OLCI. For KRK - LHR then VeriFLY would probably help, not in terms of the staff at KRK - who at this stage probably haven't heard about VeriFLY but more to trigger OLCI. I must admit if I had been in the OPs shoes I would have turned up at about 75 minutes to departure, or even a bit less, since almost everyone is turning up at 90 minutes to 120 minutes, and there isn't much benefit in trying to get ahead of that group.