Two torches, I started taking a spare when maglights were the thing. Two hours on a set of batteries and you never knew when the bulb would blow. Although I could change a bulb or the batteries in the dark I preferred to get out the second one. I still take two torches, even with LEDs and 18650 batteries that last for ever. Not needed the spare for myself but @Puffin has walked out with it.
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