The banister is in

And it looks good!

And there will still be squoodles of storage space

Floor to ceiling in the laundry (sliding doors to come)

And under the roof (sliding door now fitted)

Plenty of space for fans/space heaters; ski gear; airbeds/spare beds etc

Oh, and the skylight above the linen press, and below the stair bulkhead (optic fibre, not solar tube) works brilliantly!