You could do a black paint trim over the wooden bits. It would go with the work tops. But not so much with the creamy doors; Or get all of the kitchen units spray painted white? I think if you try to match the floor with the wood of the units in the kitchen you may leave yourself open to a mismatch or even just an overload of wood. I didn't feel there was enough black there as the island top kind of took me by surprise on first seeing it. But could you remove that granite altogether and see how it looks then? Maybe it's the black that's the problem not the wood at all

If your dream home was to use a white oiled finish would you choose a traditional wide plank or a modern style herringbone floor?

I disagree. This is standard whitewood T&G flooring. It's generally laid across joists by builders on the first floor of two storey houses as a cheap subfloor ready to take a floor finish. I've seen it sanded and varnished / stained and while it looks OK for a few months, it doesn't wear well as it's a (very) soft wood and is very noisy, particularly in the rooms under. If you want a wood finish without breaking the bank, there are some good laminates that you can lay over the T&G boards. A semi-engineered board would be better but will cost a bit more.

If I understand correctly you are adding extra floor by bay window feature ? Have you thought as out a window seat to hide the floor issue, can give you more storage and a really useful seating feature (great with kids)