What you could do, which is very similar to what I have done except mine was through stud wall.I got about 3 metres of flex, threaded it through the stud (in conduit) and out at low level behind a unit where I fitted a plug to go into a surge protector.
Where the cable came out behind the tv I fitted a double box for the cables to exit but if you dont want to do that just exit your cable from the trunking out the wall and use a 13 amp cable connector box to connect the flex to your tv flex.Job done
something like this.......
http://www.maplin.co.uk/Module.aspx?...necotr&doy=8m1
hope this helps