Vince falls for Stacey, the aqua aerobics instructor at the pool where he works as a lifeguard. Stacey thinks Vince is a bit weird until she sees his medical notes. Meanwhile, Errol has his own problems. He agrees to take part in a swimathon in aid of sick kids even though he can't swim. Vince decides his flatmate needs to conquer his phobia of saying "no".