Cast
Author Helen Macdonald follows Britain’s greatest river over four seasons, encountering salmon, beavers and the microscopic creatures helping to answer science's biggest questions.
10 November 2010
3 December 2021
8 December 2014
21 February 2021
11 September 2015
17 January 2020
2 July 1997
11 November 1979
17 July 2020
5 December 2019
24 January 2022
1 December 2017
1 November 2013
13 March 2007
12 June 2016
11 October 2011
12 August 2022
15 March 1975
30 January 2021
23 November 2011
3 July 2019