British prime minister David Cameron hails Lizzy Yarnold

British prime minister David Cameron has congratulated Lizzy Yarnold for winning gold at the 2014 Winter Olympics.

The 25-year-old Briton finished first in the women's skeleton event in Sochi on Friday.

"Congratulations to @TheYarnold - an amazing gold for @TeamGB in the women's skeleton," the 47-year-old wrote on his Twitter page.

Yarnold finished the race 0.97 seconds ahead of the USA's Noelle Pikus-Pace.