Yes it was the Polar challenge, towing the sleds, they finished 2nd (all dressed as Elvis, as they reckoned the North Pole was the only place Elvis had not been sighted at) They raised over £32,000 for Great Ormond St Childrens Hospital
http://www.gosh.org/news/latest-news/2006-archive/elvis-team-comes-second-in-sony-polar-challenge-2006/