I would suggest handing the FF the other way - aesthetically looks better paired with the pantry that way - and allows you to open both to see what needs to be restocked or to decide what to cook etc. Also for aesthetics, have the drawers either side of cooker both three drawers and the odd one other side of pillar as a two.

So, has the approach to your property changed at some point? Because I would expect your entrance hall and front door to be at the front and not at the back? Could you turn it around again? If not, maybe move the front door to what is now the kitchen, making the kitchen part entry hall and part utility (dividing wall). Then you could perhaps create one large kitchen/diner/family space from the current utility, office and family room. The current dining room could be an office? Obviously all depending on whether all that would be possible re: load bearing walls and all that.

Guess it also depends on the state they're all in. And if the sewage can be moved. By looking at your ambitious plan I'd say tearing it down and starting over might be more cost (time!) effective.

Seating needs to be central really as we need some sort of sideboard/dresser against LH wall. If more space is needed could always reduce length of the kitchen unit run along back wall. That offset pendant looks interesting, thanks - I'll look for one in brass.) I was wondering if such a light existed that can be hung both sides of the window to meet centrally and hang below it (I've been unable to find such a thing though!). Another solution might be to replace the two Velux windows with a larger, single one in the center. But from a design perspective, may this look awkward?