Daily Telegraph political columnist Dan Hodges ran through a rainy Westminster in his pants after losing a bet.
The 46-year-old ran from Trafalgar Square in London and down Whitehall in nothing but trainers and a pair of black Calvin Klein underpants as a forfeit for underestimating Ukip's influence during last year's general election.
In May 2015 he tweeted: "If Ukip break 6 per cent I'll streak down Whitehall" – but the party managed a share of the vote of more than 12 per cent.
Hodges completed the run in 3.37 minutes, despite a bookmaker taking bets on where he might get arrested along the way.
Arriving at Parliament Square he said: "I actually feel invigorated, more people should consider naked running.
"Perhaps next time we can turn it into a mass charity flash streak."
The sponsored runraised more than £1,000 for Terence Higgins Trust and Elizabeth's Legacy of Hope, through donations from Ladbrokes and an online page.