It's Prof's birthday and his girlfriend, pub landlady Val, has baked him a cake but he is anything but happy. The other officers assume that it's because he has reached retirement age and will have to go - which pleases Marilyn, who wants his job. In fact his ex-wife Gloria has sold their flat and he is homeless but with no intention of retiring. Darwin intervenes in a dispute between two farmers when one accuses the other of sheep-stealing but all is resolved and Darwin is given a lamb as a present - which he gives Prof for his birthday.
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