A friend got an LG 47LM660t and couldn't get his sky HD remote to work the tv volume. After some google searching the code isn't know, so I thought I'd post it.
Follow the usual sky instructions and use code 1293 . This still looked like it didn't work for him, but it appears the remote was confused. the up down arrows around the select button did the volume, not the volume control !
I had seen this before fortunately,
Press TV Key
Hold down select and press 2 until the remote's LED flashes twice (if it only flashes once or remains on steady I'm afraid your remote does not support this feature).
Press Sky key and it should work
if it doesn't try select and press 1 instead of 2.