I am glad you like these old original stairs from 1894. It took some doing cleaning them up. The blue finish was a furniture paint by tikkurila and the darkish stain is a hard wax by Treatex (antique oak I think?). I got a load of testers for free and patch tested them. I would always use a hardwax for stairs if you are looking for hardwearing and natural. Osmo also do a great range of finishes.
Hope this helps!
Really love the Victorian floor tiles, please can you tell me where they are from?
The Victorian floor tiles are from Martin Mosaic in Wimbledon