From carrots to cauliflower, peas to parsnips we are a nation of vegetable lovers. To mark National Vegetarian Week, Countryfile is taking a look at all things veggie. Matt Baker is at the heart of the Jersey Royal Potato Harvest. Ellie Harrison gets artistic with her vegetables to create a landscape photograph with a difference. Naomi Wilkinson tastes the delights of Indian vegetarian cooking. Champion free runner and vegan Tim Shieff goes head to head with sheep farmer Gareth Wyn Jones to debate the pros and cons of veganism. Adam Henson looks into the future of farming when he visits an urban farm built in tunnels 33 metres below the streets of London. And Tom Heap investigates the threats facing vegetable producers and finds out why many feel that the days of British veg are numbered.