N311 Stained Walnut
http://www.solidwoodendoors.com/N311-Royale.html
Staircase provided by SMET. You may view more of their gorgeous range here:
http://www.staircasesofdistinction.com/en
And more photos of this actual project on their Houzz page:
http://www.houzz.co.uk/projects/1668830/iver-a
Walnut wood for island