sorry if this is the wrong place for this..

i had sky digital installed today (in the uk) and have it in two rooms, one with the set top box in and another tv in another room connected by coaxial cable. my problem is that i am not recieving a stereo audio signal in the room without the set top box. Should i be? i have noticed that there is also a slight diaganal line problem with the same tv set - not something i expected with digital tv.
i need stereo for my pro logic set up - please help!
any ideas??
thanks