My one and only near tech charge was in Gander, did a VC10 engine change mid winter outside with no special cold weather kit, stores at Brize wouldn't issue it.
The engine having sat outside by the aircraft at night was seriously frozen, trying to open the Engine bag it shattered in my hands, fast forward several weeks and now a nice warm engine is back at Brize and in the engine bay, WO screaming mad at remains of the engine bag and looking for someone to blame.... Needless to say, he got told where to go.