One or two observations: Oak breathes, in as much as when wet it will expand and when dry it shrinks, that's why it is good for boat and barrel building, when wet the gaps close up and make it watertight. What that means for a worktop is that unless the wood is stabilised (soaked through with epoxy) it will expand and contract, if glued to the granite that means when expanding it will warp, staying still where the glue is and bending downward, not much but it will. Perhaps a less porous wood could be better, bamboo is good, then, if the counter top end is flush, you could screw and/or glue a stout batten of matching material to the end of the counter to add support ( extend it out past the front of the counter to ad support to the overhang) then glue the block to the granite with epoxy and screw up through the batten.

Thanks everyone for all the positive comments. Just to answer your query Lisa-jane. The resin which you see lite fills the hole of the groove so there are no grooves etc so no problem with the crumbs. The light; you should never need to change them they should last approx 30,000 hrs. The ones in our showroom has been going for nearly 2 years 24, 7. If you did need to change them it is not difficult.

I’m with lifestyle kitchens on this one - I think you potentially do need extra support over the expanse between the cabinet and the waterfall leg, if it’s a long expanse like your picture. If someone were to sit on the middle of that, it could break (depending on the material). We have an overhang so a different situation, but my builder arranged for some steel supports to be made to provide the necessary strength. You can’t see them as they run out from the adjacent cabinets and just support underneath the overhang.

I think keep everything light. More wood or wood effect flooring will darken the room even more. You could try an LVT or more laminate in a pale, washed out shade. The breakfast bar in white would go nicely with the current wood. Changing all the worktops to white would make a huge difference, but not a budget option unless you chose a laminate worktop. The last pic shows have gorgeous it can look.