The British Isles' top shepherds and their collies descend on the small village of Llansteffan in south Wales as we host Countryfile's One Man and His Dog 2018. Teams from England, Wales, Ireland and Scotland are all competing for the coveted trophy, each team made up of a senior shepherd and the up-an-coming talent of a youngster. This year the seniors take on trailing's most difficult discipline, 'the brace' - working two dogs at the same time, and our youngsters have an average age of just 11 years. Whilst Matt Baker takes to the commentary box, Anita Rani explores the Llansteffan ferry, making its return after 60 years, and which for generations has connected two communities across the Tywi estuary. Anita also hunts for one of the area's richest natural resources - cockles.