There's various ways to achieve it, but really depends on what you want, i.e best PQ possible, cheap solution, easy solution, wired or wireless, etc, etc....
Cheapest/easiest solution would be to use a video sender (wireless) the transmitter would connect to the Humax via scart and send the signal wirelessly to a receiver which would connect to your second TV via another scart, some/most video senders will also send remote control signals back to the transmitter too, which would allow you to control the Humax from the bedroom.
.Though the results aren't alway that great with video senders as the can suffer from interference etc.