Series 10, Episode 20
The final of the 2010 series crowned Stacey as Queen of the Jungle in what was the closest call in the history of the show. Along with runner-up Shaun, the two had to compete in a live-on-air Bushtucker trial, 'Bush Spa', which was viewed by the other contestants (except Nigel Havers) who were contractually obliged to be there. In the end the right person won - but only by a thin margin in my opinion.
apologies for some of the poorer screenshots
This article provides a comprehensive look at the entire 10th series.