Yes, Sky installed Sky+hd five years ago when we moved in. 2 x twin cables from quad LNB. Upstairs and downstairs. 2 x HD boxes.
Last year, we got an email that because we had been with them for so long, we could upgrade to Sky Q. The engineer came, changed the LNB, but used the old cables already in situ. Not sure about liability. But with Sky Q, you only ever hire the equipment. If its a cable issue, and if its something we've caused, I expect a charge. Else not.
The upstairs cables are now disconnected, as the minibox does not need them, so I cant even test using freesat on my TV due to the wideband LNB.
I was not in when the engineer came last week, it was my wife. Unfortunately, she's not as nosey as I am. According to Sky, engineers report just says no fault found.