Dave, you do need a double/quad LNB for Sky+ and double cable. Up untill two weeks ago I had Sky+ and used it all over Europe, however, I cancelled my Sky subscription and I can no longer use Sky+. It used to be that you could use a cancelled Sky+ card but Sky have stopped that. There may be a few lucky ones about who have cards that Sky have not got round to putting the clobbers on. I am not fussed as I cancelled Sky(they were much to expensive/greedy) and will buying the new Humax box(Free HD and +, no suscription) for Freesat(BBC) when it becomes available later in the year. I now have two redundant Sky+ boxes with cards. Anyone interested?
Good luck. JTS.