Alistair is feeling like he's on top of the world- he has a causal relationship with no-strings sex with Liz, and he's got a new litter of piglets for his research. William and Louise are counting down the days until they take their overseas trip, but when Louise's son Brett arrives from university in Wellington he puts the kibosh on their plans with the announcement that he intends to get married to his roommate Hannah in just two weeks!