Cloning the display to multiple TV's is the go.
It's only me and the missus, so the idea is to share the 1 foxtel box to all the rooms. Only watching in one of the rooms, so multiple channels isn't an issue.
If I can get this working over HDMI then I can clone the same idea for HTPC, PS3 etc etc.
Searching the Googles, this is pretty much what I want. Can just run some Cat6.
http://ukhdmi.com/Octava-HDOCAT-UK_QQ101767