Seb Dance, deputy mayor for transport, said: "TfL’s striking new seat design will make priority seating easier to spot, and act as a reminder for everyone to consider their fellow passengers.

Now double it for fellow coaster Stealth at 205ft — and the Big Daddy of them all, Hyperia. Oddly, you only have to be 130cm tall to tackle Hyperia solo — but you need big-boy or girl nerves.

Dual-level design. The crux of Núñez Vicente's Chaise Longue seat design is the removal of the overhead cabin to allow two levels of seats in a single aircraft cabin.

Aviation start-up Chaise Longue, the brains behind the controversial dual-level seat, announced today it’s “exploring some early stage concepts” with aviation giant Airbus.

Aviation giant Airbus is "exploring some early stage concepts" based around Alejandro Núñez Vicente's Chaise Longue double-level airplane seat design. Pictured here, an early prototype of Chaise ...