Countryfile Summer Diaries marks the arrival of summertime across the British Isles with a celebration and exploration of our seasonal foods and produce. John Craven is joined by the team - Jules Hudson, Keeley Donovan and Margherita Taylor - to report the key stories from the world of food and farming that are shaping the course of the season this year. From a secret location, Margherita is on the trail of an exclusive and rather elusive food that is worth its weight in gold. Jules is finding out whether eating ice cream at this time of the year could actually be good for your health. Nearly half the population in the UK has low levels of vitamin D, so Keeley asks if a drop of sunshine could be the answer. And rookie smallholder Paul Martin provides tips on how to create charcoal for a summer barbecue.