To throw another idea into the pot: there are some lovely spaces and opportunities for views here, but furniture is oddly arranged and blocks the flow. If the dining table were to be centred in the dining area, dropping a light to pool onto the table, it would create a convivial atmosphere for eating, and a clear view of the garden for everyone. Plus, all the chairs can be used. This area would then feel more of a 'room', and less of a 'walk-through'. The new doorway then naturally leads through and frames the view to the garden. Instead of blocking this with the back of the sofa, place it along the rhs wall near the bedroom. For this size of space, I would probably choose two comfortable, low-backed, armchairs instead of a sofa. This gives you much more flexibility and you can either push them close together, facing the sofa with a rug/coffee table between, in sofa style, or position them at right angles near the left hand corner, perhaps with a lamp table squaring them off. You also then have the option of placing the sofa directly in front of the large window in the winter when the garden is bleak, with a chair either side, facing the log burner. Assuming you want to primarily use this room for chilling out with TV, I'd put the TV in the top lh corner. This location prevents the summer sun reflecting off the screen, and you will have the benefit of being able to watch it while eating and within the flexible seating arrangements. Alternatively, seeing the fire while dining creates a cosy atmosphere and you could swap it round. Ideally, plan the location of the TV and fire around your family lifestyle, this is matter of preference and there is an argument for both. I hope this helps; you're creating a lovely, useable space - good luck!

I'd go for nothing in the bay except for maybe a low chest, the windows are very long and to close to the floor to stand anything in front of them, without obscuring them. Therefore, if you place a sofa on the long 3 m wall you can then put the t.v / hi/fi system on the shorter, hallway wall opposite, creating a focal point. Place the dining room table and chairs at the other end of the room nearer the kitchen. This leaves you plenty of space to move about. I'd have maybe side tables or a side table near to both ends or at least one end of the sofa to have a lamp for reading etc You could also opt for a standard lamp!

Thank-you very much for the comments. I hope it will be a great space, but playing around with it and changing the design at the last minute is getting a bit stressful! This is the design that the build company showed us initially - just their initial thought as it how it would look. I found feeling the area where they had positioned the fridge/freezer very tricky. We want a free-standing french larder style fridge and the doors and level of matching with the rest of the units didn't seem like a good fit. The support pillar for the steel that crosses the island in the attachment below has also been a real annoyance. It sticks out 23cm, so it can only really go through empty-ish cupboards. Clearly anything to the left of that steel is difficult to vent. On the design in my intitial post, I was intending to have a dropped ceiling element that stretched just beyond the steel. This would let me have a powerful extractor and exit the flew onto the flat room (hidden by the drop ceiling 'box'). I like the idea you describe of a full wall of units, then island, then table. I guess Jonathan's proposal is similar to that. While I love the efficiency of the "4 double door" hideaway I just don't like the aesthetic, so will need to think about something else. Bringing it back to what we need... Utility room: enough to stash the washing machine, store the vacuum cleaner and hang a few clothes. No need for a sink. Free Standing, 90cm wide fridge, nicely framed either by wall of kitchen units. Waist height oven with an additional "top oven / grill (broiler)" - so at least one full height column. Good size kitchen island with at least two seats. Approx 90cm induction hob, plus a gas domino hob. Powerful, externally venting extractor over hob. I'm relatively open to moving the kitchen/living area to wherever it works best. I'm also not desperate to have the hob on the island (but that would be nice). As far as I know, the builders haven't done anything that can't be easily adjusted at this stage - but I think that will change in a couple of days - and they are planning for the kitchen to be in the old part of the house. As for rooflights - I thought, perhaps wrongly, that it would be light enough with the big bifold doors. It is an east facing room, and the old room had some sliding paitio doors and it felt bright enough. So I have left roof lights out on the basis that - but I'm also concerned about noise. (Cheaper too!). The biggest window we can gave without incurring significantly more cost is 1800mm x 1000mm - I'm minded to be 2 or 3 of these in that middle section. Thanks!

Be careful with tv up on a wall if anyone has neck problems or arthritis as it can exacerbate symptoms. It is advised that the tv should be below the eye line.