It’s been nearly 50 years since invasive American Signal Crayfish were introduced to the UK, and we still haven’t figured out how to get rid of them. Hugh Fearnley-Whittingstall joins Sheila Dillon to meet a man who believes the way to control their spread is to get more people eating them — but not everyone’s convinced. These crustaceans are so invasive that ecologists worry encouraging consumption could lead to further spread. Meanwhile, in parts of the Southern US, crayfish are a beloved delicacy. Sheila heads to a crayfish boil in London to see how that tradition is being recreated here.

Presented by Sheila Dillon