This month Vicki and Hunter go in search of the limits of obsession. Vicki met the man who has swam the English Channel 34 times and who's next swim will be his greatest physical and mental test yet. Meanwhile Hunter caught up with an adventurer about his legendary swim over the UK's most treacherous waters, a place which has been nicknamed "Hell's Mouth". We also hear from a stand-up comedienne and the UK's preeminent marathon swimmer who's also happens to be an expert in hypothermia. This one's a real corker!