We actually did this when I had NTL.
It was routed through the coax up to my brothers room.. since it was directly above the living room where the box was located we routed some optical fibre through the floor and discretly aimed it at the box from the corner of the ceiling.
Worked a treat, you just just aim into the optical fibre and it'd change
Was quite annoying tho'... One second I was downstairs watching the footy, next second Cartoon network came on
