Hi Ellie - exciting project! Will have a think but here are my immediate thoughts. Being in the middle of something similar, with a left-right width of 5.5m, I was cautioned about putting my Island AND table in parallel, running north-south, on account of not having enough space. It so happens that it’s going to fit (just!), but this makes me think that you could struggle putting a table between the island and the patio doors. For clearances round tables and kitchens, I’ve found the Thirty-One Design Rules on Starcraft Custom Builders’ website to be a very helpful guide (in inches, but whatever). I’d also think carefully about the traffic pathways through the room. The bottom wall is current a thoroughfare between the kitchen door and bottom of the stairs, so I’d put less frequently used things there. The fridge and pantry cupboard is good. You have the main working wall in the right place, but now you have to think about how to get people from the kitchen door to the back door or the patio without getting under the cook’s feet... Are you committed to the patio doors? An alternative would be to put an L-shaped kitchen in, by continuing the long run along the outside wall some way to accommodate the sink and bins, maybe something else. You could then drop this back down into the room to make a U-shape, OR just get a really great table as the centrepiece of the space. It’s then clearer to others where to go, they’ll stay out of the work space. AND, to redress the glazing deficit, put a giant window above the worktop on the external wall. I’ve seen an example on Houzz where this was actually a bi-fold window so the kitchen countertop acted like a bar in summer! Oh, and a reading nook at the bottom of the stairs in that bay window...? Just something to think about... good luck!

Hello Sabina, Maybe the conservatory could be converted into a utility shower and the kitchen could be placed next to the stairwell. Of course, this depends on whether the plumbing can be relocated.

Could you put it under the stairs and knock through to use the pantry for size? or is it very low?

Consider turning the current upstairs master bedroom and Ensuite into two children bedrooms with a modest bathroom in the middle. This would mean you would have three upstairs bedrooms but personally I would convert the two downstairs bedrooms into a master suite where the head height is better than upstairs