This series explores five of Britain's most extreme winter landscapes, looking at the conditions that challenge both the wildlife and people that try to survive in the countryside and uncovering a world few get to see.

Ellie Harrison is in the UK's largest estuarine habitat in Morecambe Bay, Cumbria, as she reveals the lure the mud and reed beds have here for fishermen and migratory birds during Britain's harsh winters. She also happens across a very unusual and exclusive gentlemen's club of grey seals on Walney Island. Show less