I have tried uploading CAD images and Plans but because they aren't 'photos' they are taken out of the photo section . There still doesn't seem to be a proper drawings section yet either ! It's definitely something that's needed I agree !

Afternoon, As a rule of thumb the ideal size of a pendant or chandelier can be determined by measuring the length and width of the room in feet and adding them together. Whatever number you arrive at will be the diameter of the fitting in inches. For example, your living room is roughly 14’ x 21’. 14 + 21 = 35 Therefore the ideal size for a pendant or chandelier should be 35 inches. If you’re unhappy with the light output, check the stated lumen output on the fittings you bought and do the same with anything you’re looking at to ensure you get more from the replacements. You should also consider adding another layer of light using table and standard lamps. Doing this will increase the amount of light available and at the same time, because you can choose which lights you have on at any time, gives you a bit more versatility and adds a bit more interest to the room. I hope this helps. Kind regards, Inspyer Lighting Design

Going back to a decent layout and taking account of where the electrics are and the radiator, i'd ditch the large dining table idea. Go for a small drop leaf table that can be brought out and extended when necessary but is small enough to provide eating for two the rest of the time without being in the way. You can accommodate two further dining chairs elsewhere to bring out when needed. At least that way you get a good lounge layout. Plus you now have room to walk around and get through the patio doors.

A vertical split would allow for a toilet and sink only, with a huge BUT: The minimum width of 78cm plus wall thickness (10 in drawing) would narrow the entry even more. Can't even keep the door, as it simply wouldn't open. And with the 60cm wall in the top left, you'll have 80cm in front of the washing machine (assuming it could go at 60cm deep, which it often doesn't). A horizontal split would allow for a reasonably sized shower room, plus a small utility area. Again the 60cm wall bit. So question would be: Could that bit of wall be cut open a bit more? The cupboard is still cupboard, as 70cm is not wide enough for a toilet. Vacuum might like it there though. ;)