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For the benefit of those of us who have not memorised both the entire BA timetable and BA's fleet, this is TLV to LHR, and it is a 777-200, G-VIIO. And as a layman, I think this is referring to the reverse thrust stage just after landing, when briefly the blue "thing" on top of the engine retracts for up to a minute or so, and then slides back into place. And nothing to be alarmed about, unless it doesn't happen I suppose.