Anyone know what this is? Saw it at the Bike Shed London and it's bloody beautiful

https://i.redd.it/rdg93iq3due21.jpg via /r/bikesgonewild https://www.reddit.com/r/bikesgonewild/comments/ankp1l/anyone_know_what_this_is_saw_it_at_the_bike_shed/?utm_source=ifttt