Idea 1:

Idea 2: (Should I have wall cupboards either side of the hob?)

Looking forward to hearing from you - thanks!

What a big space.

I always recommend a 900 x 900 L shaped corner unit as opposed to a straight corner unit. On that straight 900 unit you will only have a 400 door and that makes it very difficult to get into the corner. You will be on your knees. If you have a 900 x 900L you will have 2 doors that open therefore enabling you full access into all of the corner. If you swap that you will need to amend the adjoining cabinets because of the size.

Just be careful of dropping the DW door down if it’s by an exterior door. Many of us drop it down when the cycle is complete to cool off the pots and pans. You don’t want to walk into it.

I think my preference is the first plan. To me it balances better. Plan 2 seems empty with nothing on the wall unless you intend to add shelves.

Thank you for your comments @Daisy England, really appreciate them.  

Good point re. the dishwasher door.

I get what you are saying about the corner cupboard, but I currently have two 900 x 900 L-shape units and I don't like how things disappear to the back and I'm on my knees to discover what I have lost!! 
I intend to get one of these pull-out units:

DO you intend to eat at the counter/island, or do you have another space for a dining table?

I prefer the second one as I like a full wall of tall cabinets - really nice that they are set back from the kitchen so not jutting into the room. i feel like it opens up the whole room a lot more than the first with those tall cabinet dividing that wall. it also provides more space around the hob which I don't think the first option provides. I'd just have more of a think about which tall cabinet go where - fridge and larder needs to be closer to the action for me, but ovens and freezer can be further away. i'd also consider double ovens on a vertical stack rather than side by side so it frees up space for more useful larder space - maybe a small appliances cupboard or bar area for example. And go through everything you have and plan for where which cupboard/drawer it will go in to see how many units you need. The units at the far end might be great for toys and art supplies for the kids, but if you don't need the storage then think about whether you really need them - perhaps a freestanding piece of furniture would provide enough storage and be nicer to look at?

@twamleyk We do have a separate dining room for main meals & entertaining, but we intend to use the island as a place where the 4 of us can have a quick meal together, and the children will always have their breakfast there... And it would be a space to sit for morning coffee, kids to do homework while mum is prepping dinner, to chat with a friend, baking with the kids ....etc etc!

Personally I think that you could reduce the number of steps by putting the fridge ovens, sink and hob all on island and one side of the kitchen only.

You might consider going for a longer island as there is unused space towards the centre of the house.

You could even get rid of the back door and kitchen windows and replace them with French doors or bifolds.

One option

I think plan2 looks/works best but i'd suggest a few changes.

For the tower run, having only a 20mm filler is to tight and doors open more than 90 degrees so they'll be rubbing at the freezer end, i'd suggest changing the 600 and 800 larders to a 1200 breakfast style larder, having drawers and worktop inside, shelved above and power for toaster etc, the doors can be pocket style so they open then slide down the sides out of the way when in use, make the wall nib a bit wider by about 100mm so you have 50-70mm fillers at each end, probably bring the towers forward (or make them extra deep) and this would allow for the pocket doors to slide away more. Depending on ceiling height you could have extra tall towers or top boxes on top and then infill about 50-100mm up to the ceiling. Also check the height of the appliances as in the pics it looks to high, i'd have a 450 frontal with pan drawer and internal drawer instead.

On the opposite wall as long as all the 800 drawer units end past the window is good, window sill same as worktop possibly, (either end the run before or after the window) lose the 400 open unit in front of the wall nib and have a door (door could be made to look like 2 drawer fronts to match) on this as it will be just a dust trap, in the 1000 drawer units i'd suggest having internal drawers for utensils etc, the corner unit is good especially with the fly moon pull out as they're great (in my opinion) and as the corner post is made on site its gives the fitter more flexibility in positioning the units as its not a fixed corner. The sink run is fine but i wouldn't suggest opening a d/washer door to let the steam out as it can damage the surrounding doors, cabinets, decor panels and even worktops (thread on mumsnet where steam has damaged granite worktops).

For the island if a 500 bin is big enough then fine but you might find a 600 pull out is better as its usually a 4 bin unit, possibly change the 1000 1+2 so its a 2 pan with internal drawer and then on the other side i'd have 2x 800 which would look more symetrical.

For wall units its up to you, but if its an electric hob (especially induction) the extractor should be wider than the hob and if this area is going to be a main prep area than having wall units you can add extra lighting.