I think they are all headed for T3, BA certainly and as TAM is joining OW then that’s likely too. As LY are aligned to no one they will always be a misfit to I guess the answer is wherever their particular security requirements can be best met.
As for permanent volunteers at LHR, should these people not be employed as we are told it is such an important role? It seems very questionable to me. For the Olympics there was certainly a special role which was very well carried out across London but it’s hardly ongoing.