Margherita Taylor discovers the high cost of plant theft at a garden in Hampshire, which has had to take extreme measures to deter the criminals. On the North York Moors, Keeley Donovan descends into the second deepest mine in Europe to see for herself where the grit for our winter roads comes from. In a bid to find out how to repair his own stretch of waterway, Paul Martin finds out about some of the work that goes into keeping our canals in tip-top condition. And Paralympian Steve Brown is in Reading, looking at new research that suggests we may be doing more harm than good by putting food out for the birds.