Oh, sorry, that is old news ! Can't really see KUN being seasonal, as it's a 'commuter flight' for e.g. family visits. KUN is not really a city-break destination. So I guess it's lost to BHX (I think they moved it to LTN, LGW or LPL):
Kaunas Airport - Winter Timetable
So as people frequently said, FR's "base" at BHX is indeed hardly anything anymore. Small comfort for me, as I lost HHN early-on in this ordeal.