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So, if the void has solid insulation that could make it impossible to rod it unless there’s a consistent gap all the way across.
https://www.toolstation.com/super-rod-starter-kit/p75626
That’s the kind of thing you need. Which admittedly is expensive. It’s also fiddly. They do their job very well, but there’s a bit of a knack to it. It’s also hard to drop £50 on a “give it a shot” tool. And that only gets you along the ceiling. If you can extent your “loop” (the live, neutral and earth that feeds all lighting on the circuit) to the wall, you could then drill through the wall to get a feed to the outside, and have an unswitched light (something on a timer/daylight or motion sensor), or use a smart bulb and a wireless switch.
What does it look like on the outside?
Either way, by this description you probably get the drift that it’s unlikely to be straightforward.
Edit: @Airhead has made less of a meal explaining it.
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Nef
@Nef here’s the situation.
The switch by the world smallest door controls the kitchen lights (2 pendants) and used to turn on an outside light but has since been rendered useless due to no neutral being available.
Sparky says the only way is to get a neutral from that light.
There is a 50mm void above the gyproc and battens but presumably the cables run through a channel up there.
The main issue is that wall is packed with Celotex type insulation so getting anything down there would be a massive faff.
I’m fine with the faffing if it’s possible. But I can’t go chasing into walls as we’ve just finished the kitchen and I’ll get into the troubles.