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Thanks. Definitely not going through the floor for a 2m run, especially as the new socket location is in eaves with nothing behind it. Should be easy to drill through in the corner.
I think I'm going to go with some oval conduit / conduit clips.
Assuming some pre-mix plaster to fill the hole then a skim of fine filler should do the trick? I'm hoping that I can get away with leaving a lot of the plaster in place by cutting only where there are dots behind the board and feeding the conduit through.
Soul-
It's quite useful to save the plasterboard if you've cut it out with an oscillating tool or stanley knife and then put a larger sheet of plasterboard into the gap, screw it in above and below and fix the old plasterboard to it. That way you only have a small cut line and some screw holes to cover. It's especially useful if the plasterboard is skimmed because it will then match the depth of the old finish.
Airhead
I was questioning myself as I wrote it. I have done it before but didn't think it was allowed. Maybe someone else can confirm. Further searching reveals it's muddy waters.
The underfloor route would often be preferred as corners tend to have a bit more going on structurally but that depends on the age and construction and I think you're in a new build?
I see now why you are thinking trunking would ensure the wires stay on the horizontal. In my experience trunking is not often used in walls. There's a type of capping which is useful in solid walls if you are plastering over the chase.