Do you intend sharing your
Sky UK card with your friend? If so this complicates things a little. The card will need to be inserted in the Dreambox, in which case your
Sky Digibox will only be of any use as a Free to Air receiver.
If I were in this position, I'd do one of two things.
1: Buy two dreamboxes and ditch the Digibox. This would allow you to view all your
Sky UK channels in both the living and bedroom as well as those that your friend shares with you.
2: Put the dreambox with the card inserted in the living room and use the Digibox as a FTA reciever in the bedroom.
PS:
Sky UK have a card swap in progress at the minute, so if your intention is to use the
Sky UK card in the dreambox, I would hold off on buying any equipment until its known for sure that you can use the new cards.