Keeping Mum

Season 2, Episode 1: The Picnic

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Peggy wants to go on a picnic so Richard and Tina take her in the car, dragging Andrew along. Since it's raining hard they go to a stately home, where Peggy gets chatting to a group of old people visiting from a home. When she gets counted in with their number and driven back to the home Andrew must go and retrieve her.