The sports headlights worked though.. I can remember standing on a gun position in Otterburn in the 70s in the small hours with an Ac IG whilst a battery of Abbot came in on IR headlights. The AcIG had CUBs and could see what was happening, I needless to say, did not and could not..
Abbott brings back memories, on the move they were cramped inside - like an oven in summer and a freezer in winter - we cuddled up on the cam net which was stored inside. We could handle that but...... if the BV (Boiling Vessel) was knackered it was misery.