Every day this week, John Craven and the Countryfile Summer Diaries team - Keeley Donovan, Jules Hudson and Margherita Taylor - search the British Isles for summer treats. Today, Jules finds out how changing our shower gel could help save our seas and protect our marine wildlife. Keeley reports on the summer battle between fruit farmer and Mother Nature. The arrival of elderflower is a sure sign that summer is here. Margherita joins the pickers bringing in this year's harvest. And in Wiltshire, Paul Martin provides top tips on combatting pests on his allotment.