I can't think of many recorded incidents outside of winter, admittedly. That said, how many wild campers are there really, out of the walking population? I'd argue anyone who wild camps off the beaten track is likely in the to 1% of hikers who are comfortable, fit and skilful enough to perhaps not fall victim to the other issues, or certainly nowhere near as often.
Of all the rescue callouts I'm aware of, it's very rare to have someone light a fire as a primary means of surviving the incident, especially in 3-season conditions on an island with this much precipitation. Usually most people (with means of shelter) are either in a tent + sleeping bag, huddled up waiting for help; or they're immobilised from some kind of incident and likely haven't got the mobility to make a fire. These people are usually hypothermic and perhaps not in the best state of mind/use of their fingers to start prepping wood for a fire. The nearest I could see to a likely scenario would be the recent(ish) Yorkshire Dales hiker incident where he was missing for several days and the area he was missing in was huge. I think this guy did have some extra food with him, but once that starts running low your body is going to start feeling cold and I could see putting up a tent and prepping a fire as quite a sensible skill to have in the tank.
That said, there have been times where in the depths of winter we were extremely cold at camp due to the weather being unexpectedly well below freezing, miles away from anywhere we could 'walk out to', and I've lit a fire to try (from dead wood) and reduced the amount of hours where we freeze in a tent. Cutting a lot of wood and feeding it for hours certainly warms you up, particularly when it's so dark so early in the winter months. But I wouldn't say this turned an incident of 'death to life', but it certainly reduced any chance of exposure becoming worse.