The layout of your new kitchen will depend on a number of factors, not least where the waste water from your sink, dishwasher and any other appliance that uses water, enters the drainage system. Moving any of these is not normally a problem but you may be restricted as to where certain appliances need to be positioned in the kitchen because of where the drains are. The usual method of planning a kitchen is to design the layout making sure you keep the distance between the key elements to a minimum. Having the food preparation area close to the sink, cooker and fridge will ensure you don't wear yourself out, running from one side of the room to the other. Without seeing the size and current layout of your kitchen, it is impossible to make any further, useful, suggestions. Choose your kitchen fitting company vary carefully and don't be shy in asking lots of questions, if they are any good, they should answer all your questions in detail. Hope this helps.

Been thinking about this one overnight:- ( i have a sad life! all say ahh ) You do not have to have a window to call it a habitable room, however, I believe there is a building control requirement for the room to be vented through another, check that out. So, in short, yes the bedroom could be moved and not have 'windows' . I don't know the arrangement of the wall top left that goes in to the garden area, but bear with me. ............ would it be better to have a separate Galley kitchen? I would prefer so. Is there a possibility of a window far top left? A stud wall only takes up 4" so not a great deal of space, plus it would make the lounge / diner look a lot nicer without seeing the kitchen on view permanently & of course you get a longer kitchen run. ( I think the proposed one is too small ). Plus you gain a wall to the lounge area, always handy for furniture placement, as this is what is lost in an open plan arrangement. I also changed the bathrooms round as previously suggested, and had the entrance in the hallway for the second one. Please bear in mind as a said before:- Not to scale - don't have dimensions as had to guess, but on the face of it, likely do'able. I like running plans through estate agents...........ones that I know well and trust as I know they'll give me their honest opinion on what would infinitely give a better price on re-sale. Contained living and dining with separate kitchens, good sized bedrooms etc. So do ask one. Estate agents are handy, they will want you to get more for the property because, if they smell a sale, they get more commission! Roughly where i was going with this after some sleep!Of course, if you still want to go open plan with the living / dining/ kitchen, then lose the top wall and maybe consider a door system to open and close for entertaining purposes - No doors, fully open plan .with doors!

Had some thoughts about your garden and came up with a rough sketch:) (see pic). Decking outside the garden office would look nice but I’m not sure about bringing it all the way to the house as decking can take a fair amount of maintenance although you can get composite decking or slabs that look like wood which would probably be easier to look after. I think breaking it up and having some planting would be nice and more pleasing to look at. So on the sketch I brought the decking to surround the office windows then added a small seating area and space for planting which could include a small pond or water feature. This could be like a contemplation area where you can relax and have a tea break:) Instead of decking pathway I think slabs or tiles to match the patio would be better. The patio I’ve kept as is but extended a little to include bbq area. Did think that putting the bbq on the right side of patio might be good as well. Put in some extra planting areas but that’s just because I like plants:) planting pocket is basically a hole in the deck but some tall grasses or similar with lighting would look great on the left side of the office and help to balance things out. Not sure on a pergola mainly because I think adding another tall structure on the left would make that side of the garden seem overly busy but it’s entirely up to you what you want. Anyway hope this gives you some fresh ideas:) P.s. sketch is not to scale.

Would it be possible to move the door so you could gave a shower tray on the 120cm wall? Then you'd have plenty of room for the toilet and basin/vanity on the 170cm wall.