With round only 2 people will be able to reach it. Lay out an oval to see if 3-4 may be able to reach it

Your cushions don't fit properly. It should not hang over the end and the other shouldn't have a bump in it

How many people do you realistically think you will seat there on at least several occasions?

Yes, round is limited to 2 on benches but if you have a simple straight chair somewhere else, can seat a3rd person opposite. Also a square might work especially if you could find one of those cool ones with hidden sliding expansion leaf, so the footprint is small for everyday but might seat 4-5 when expanded, again making use of the “ open” side for a spare chair.

Complement the modern cabinetry by using white (will also make the space feel larger) and bring in the green with art (more dynamic) vs your mirror idea (a pain to keep clean).

Look at round, oval and square tables and note dimensions; see what makes more sense getting in and out, especially with drawers being so close (and if adding any chairs).

When adding sconces, placement and proportions are important so they don’t feel lost on wall or interfere with people getting in and out.

Design Fan, your pics are what I had in mind for round example, where the extra chairs on the outside work for having guests.

The round tables with center support have advantages because, no legs to interfere with chairs.

Thank you for your comments. Well spotted regarding the ill fitting cushions- the supplier got their measurements wrong. 😡
Most of the extending tables I’ve seen don’t have a pedestal type base which I think is essential for leg room here.
Yes, the mirror is going on one side of the banquette with two wall lights on the other. I did think about a pendant over the table but it’s too small a room to have that and something else in the u of the kitchen. So I’m planning to have a modern chandelier central to the room. Also under cabinet lights and lights over the wall cabinets.
Yes I am putting chair on the other side of the table. I have two bent wood chairs like the one shown . But the table needs changing. Could stain it to match the chairs ..

This shows that I’d have a rather lopsided lighting situation if I put a pendant over the table

These are the chandelier and wall lights

Ignore the floor and the wall.. the raw floor boards and unpainted lining paper will go!

I'd go for either round or square for the table. Perhaps a round trestle base would be best:

Something like this, but perhaps a bit smaller:

,

Which is what I have now but it’s the wrong colour. I’ve tried a square but the round looks better and when it’s good friends you can fit more in than you think!
Do you think I could stain the top to match my chairs and paint the base black? I also wondered about changing the base for a cast iron bistro style

Never done this before. It’s very helpful talking it through thank you