Its just the family room, not the front room, its a big area, the chimmney breast is the best place for it, yes it will be quite dominating, and maybe a bit high (ive thought of this) but should be OK, these TV's are very good for watching from quite a range of angles, IF i have it low like the CRT we have in there then it wont be visible from the dining area or the kitchen area.
The drilling accross the corner of the breast was on advice from an electrician pal as it saves chasing the wall out around the corner it get the cables from the side of the breast onto the front of the breast they are then in plastic conduit, no one said the cables run diagonally they only run either horizontal or verticle are per regulations.
I can chase it out around the corner if I have to, but I dont want to just plaster some leads into the wall and have them dangling! I would prefer to have a wall plate on the front of the breast to plug TV into and the same plates on the side of the breats to plug the sky box into. (the two plates obviously connected through the wall)