Here in France (and in Spain) all electric wiring is enclosed in flexible plastic tubing, called Gaines. This tubing runs from the fuse box to each outlet and the wires are drawn through the gaine. Needless to say there should be no kinks when laying out this tubing or the wires will be difficult to draw.
I have this gaine running from my attic down inside the walls to the TV outlet and have recently (because of having the need to have two satellite feeds to my TV) just pulled through another TV coax to the wall outlet. Oh so simple!
So at the moment I have a regular terrestrial coax and two satellite feeds running through this gaine, and room possibly for another cat 5 feed (latest TVs need an internet connection!!
This is the stuff
here. I shall certainly use it when I get back to the UK, not too sure I want to chase out the wall though!!