Make sure that the hdmi leads are not in the same cable run as the aerial RF lead . Keep the 2 at least 9 " apart .
Personaly I would go 3 x hdmi , 1 x network feed & 1 mains . Scart on a "state of the art " is a waste of time + if you need to feed Low resolution video feed you can plug it into a SKY receiver that will forward it to the TV ,
PS hdmi switches work but can get confused and require intervention to switch them over or they lock out , better to put the cables in correctly in the first place and do the swithcing with the TV .