I believe I mentioned the conservatory under the window.
My plan is now to fix wooden, carpet-covered skis to the feet. This will enable us to push/pull with the rope up the stairs, while maintaining a foothold for the person at the bottom. The only issue then is getting it onto the stairs over the newel bottom at the bottom. Once on the landing , it can be cursed and sworn into the adjacent bathroom-to-be.
Then I can build the stair balustrade.
I'll keep you posted.
Cheers Richard