A convertible Rolls-Royce with a back deck that opens up to reveal cocktail tables, fridges for champagne and a parasol matching the vehicle's baby blue colour scheme is now a reality - for one ultra-wealthy individual.

The "Boat Tail" car, so-called because its rear is shaped like a J-class racing yacht, was hand-built over four years according to the detailed specifications of an unnamed client of the elite automaker.

"The outcome is one of the most remarkable cars ever in history. I would even say it's probably not even a car," said Torsten Muller-Otvos, CEO of Rolls-Royce Motor Cars, which is based in southern England and owned by Germany's BMW.