Countryfile - 949

To coincide with Holocaust Memorial Day John Craven travels to Poland with a survivor from Auschwitz to see how the countryside became the last hiding place for many escaping Nazi persecution. Adam Henson investigates how carp is making a comeback, while Michaela Strachan discovers if she's got what it takes to brave outdoor winter swimming in icy cold water. Miriam O'Reilly finds out how plant-based fuel may eventually replace petrol in our tanks.