Getting under the house isn't an option, and phone points aren't
in a useful location.
Ahh you have one of those low slung models :) That does make life trickier. If
you can roll your own cable, and its not solid brick because there's plenty of
those there too, it might be conceiveable to go through the wall above the floor plate. If you wanted it to look neat stick a wall plate on each side. Floor plate will rise about 50-60mm above the floorboards usually. It'll be behind the skirting, thats nailed to it. A bit of filler and a quick touchup when you move out :)
Spec
--- SuperBBS v1.17-3 (Eval)
* Origin: < Scrawled in blood at The Lower Planes > (21:3/101)