If you jump on the facebook page there is loads of info on there, most are washing the suit in a convenient beck or at Whinlatter en route.

Generally a swimming specific wet suit is best but at least 1 completion was in an Otillo style suit, worn all the way round.

Any stroke will do, and the swims are not excessive TBH, the daunting one is Derwent at the end but this is broken up by 3 islands that reduce the psychological issue.