You will also need a phne point at the location where you want your second sky box for multiroom. Personally, I would provision for a phone point at your main sky+box location also, so may be worht considering running in phone and coax to each point. Depends on how far you want to go with this really, but the basic level you should put in imho is.
1) Main sky/linving room:- 4 coax cables (2 for sky+, one for terrestrial arial, and one for sky retrun to rest of house. 1 phone point for sky box
2) Other rooms, 1 coax cable (I wouydl go for 2) and one phone point
Make sure you put in high quality sat xoac cable, and not the cheap stuff!!
Wexfordman