Nice! avoiding recessed lights is a great idea. The Brightgreen website is a great resource. You can calculate the amount of light required for each space by changing beam angles, ceiling heights and color temperature. The calculator isn't set up for wall scones however the same rules apply. Ceiling mounted lights are also a great alternative to wall scones. Hope this helps. https://brightgreen.com/led-lights/d900.sh-curve-downlight 

Bigger doors are perfect as a statement but also to move large furniture in; Pivot doors look fantastic but watch out for kids arms getting caught in the gap; once they start closing hard to stop at the short end!

You can put a pendant in the existing socket then move it over with a long cord to place it over the dining table. This is quite common. You can use surface mounted downlights as well.

We too live in a cold winter climate with our bathrooms all on the southern side and faced similar issues as you do. One smaller bathroom does not have a window so we put in a Velux skylight which provides amazing natural light through the day. This may not be to your liking, especially if you have a period home. We also use heated towel rails and under tile heating (just enough to take the chill off and stop mould) in winter. Although we have a light in the shower recess, a bonus is the large fixed shower head with inbuilt LED, which at night gives the feeling of showering under moonlight. We chose light colours and mirrored recessed cabinets to reflect as much natural light as possible.