For that kit, I’d install using ebay HDMI cheap cable.. dont believe this shit that expensive cables make a difference
PS3 into TV using HDMI
Humax via Scart (Or leave out as it has its own Freeview)
Speakers into PC, PC into your existing monitor as there is no mention of VGA compatability on this model of TV
(that doesnt mean to say that there isnt one)
*edit* Just read your post and the geezers reply, the humax from the looks of the back of it doesnt have optical output, so ignore that bit. Totally agree with his last comment though. 😆