Adrian Chiles and Nadia Sawalha present a magazine series featuring a mix of interviews, topical reports and features from around the UK. Dan Snow needs a head for heights as he goes in search of the hidden history balanced perilously above the Thames estuary within a forgotten World War Two fort. And it's the penultimate day of the 16-60 Challenge, which sees a group of teenage couch potatoes pitted against a team of health-conscious pensioners.