The Sunday race along London's Alexandra Palace course, which was the first in London in nine years, featured racers competing with their gravity-powered vehicles while about 20,000 spectators looked on, The Mirror reported Monday.
The teams were judged on speed, creativity and showmanship.
Christian Horner, Red Bull's Formula One team chief, was among the judges.
"It's been an absolutely fantastic day -- the effort from all the participants, the enthusiasm of all the 20,000 people here, a stunning day weather wise -- it's been a perfect afternoon," he said. "[It was] an event that only Red Bull could put on."