I'd put the TV on the opposite wall in the living room so you can see it from the kitchen while making food.
I'd also put a sofa bed in the room with the computer so you have all the room you need to make it a comfortable study/gaming room but then easy enough to sort out for friends/family staying over.
I think in the long run all our spare bedrooms are going to have sofa beds so that we actually make use of the rooms more than just literally 5 times a year for people staying over.
I hear you. Problem is the pre wired sky point and phone connection are all on that right side wall. I'd have to send all the wires across lounge to reach other wall. Bit of a pain. Could wrap them around side of terrace door though with some trunking perhaps.