In Barnsley, farmers Rob and Dave Nicholson pick sloes from their farm hedgerows before turning them into artisanal chocolate. JB Gill takes a trip to the rolling hills of Wales, visiting a farmer reaping the rewards from a rather unusual diversification - making medicine from daffodils. And on his farm in the Cotswolds, Adam Henson works hard looking after his native pigs, who are some of the rarest breeds in the UK