Is there any way to check for sure which IFE (Thales vs. TES) a flight is equipped with? Is is a 4-class 14F 777-200, so either RAES or one of the 4-class VIIx.

MMB and Expertflyer indicate 77E, although I have managed to find at least six other 77E departures on the day of travel (Feb 26). IIRC the only TES equipped 77E currently based at LHR is VIIX, so I am hoping to avoid this one.