Well, kind of. Will achieved media saturation in an all-in-one Hulk costume (at the expense of being able to breathe); and Katie not only made the finals of the breaststroke but also get a honourable mention in the novelty hat competition for most appropriately named hat. Success doesn't get any more heady than that. Everyone else tried very hard, even when wearing dead-weight chipmunk hats.
Nice write up here in the Guardian: http://www.guardian.co.uk/travel/2013/jan/28/cold-water-swimming-championship-tooting-bec-lido