Image 1 with bigger kitchen. Looks quite good. Dining area is very generous at 6000mm, as is the laundry at 2500mm wide. Many laundry's are 1800 wide which is acceptable so 2500 is generous indeed. Good for ironing and clothes sorting. Cavity slider to pantry as it'll be open 99% of the time and look like 'no door'. Make study bigger by relocating the bedroom BIR to run along the hallway wall near the door. It'll make the bedroom smaller, say 3300 (600mm for BIR) but thats still quite good for a single bedroom. Also easier to furnish as it reduces circulation pathways across the bedroom. Also make entry area wider with the possibility of a wall to define the entry rather than entering directly into the living area. You'll need a place for coats, shoes, etc. even for guests to place down their items so a bench or a cupboard to hide everyday items is a worthy addition. Watch out for the tall windows as they diminish your furniture placement options. Privacy and energy efficiency comes into it as well. Views are important but its a combination of everything.

Thanks everyone - your comments and diagrams have given me plenty of ideas I hadn't considered. Perhaps shifting the wall is a little drastic! I'm now thinking of going a long U shape like this. I'll add a few upper cabinets on the left side too for the most frequently used stuff from the pantry (as the pantry is still a distance from the stove/oven). The fridge as you can see is now right amongst the action. We also have a chest freezer hiding out in the laundry which I can move into the old fridge space...alternatively I might convert it to a computer workstation as suggested. I'm leaning towards a peninsula rather than an island, just because I feel like it will give me a slightly more efficient/seamless work space, and we don't expect seating at at the island/peninsula will get used much given how close the dining table is. Any thoughts on this revised layout?

without the plan of upstairs i'm not sure that my suggested changes to front wall will be suitable but instead of reducing the rear deck, taking space off the front porch would allow extra space for the kitchen without changing the front set back and, unless there's some special reason for the extra toilet could you consider different access to the downstairs bathroom to have a more private toilet with included handbasin with or without the extra sink in the dining area?.. there's enough space for extra storage for utility and dining area with a table for two in the kitchen and extending the floor of the deck to the rear and side fences would allow more outside sitting area

For drawers I would suggest one shallow drawer and two deeper drawers below. The following depths. 120 internal 180 front height 240 internal 290 front height the width of the drawers will depend on the best measurements for your kitchen space. i would do two sets of drawers next to your existing 450 wide bank of drawers. Keep those drawers for cutlery etc. new drawers can be used for cups and pots and plastic ware and food, whatever you like. if installing a freestanding oven, you will lose the other cupboards, keep the existing drawers that are under oven, convert oven to another cupboard. leave cupboards under sink. Or if budget allows have the same set up as above, with cut out allowing for sink plumbing.