We have just bought a used beovision 3 (instead of getting that HD stuff) and had it installed by B&O, who linked everything up, including the sky box which (then) worked on the Beo4 remote.
It was fine for a few weeks then it started playing up. The Beo4 has no control over the sky box.
The only thing that could be fragile is the remote command which is stuck to the front of the skybox.
If anyone has got any guesses...