Strolling through a walking track in South Buckinghamshire, I am amazed at the sight that greets me. Up ahead, the trees that line the track are filled with colourful fruit in varying hues of yellow, green and red, which hang like jewels from their branches. My husband, John, tells me that these are wild cherry plums, that you can pick them and yes, you can eat them. Foraging for fruit, he explains, is a pretty common activity in this part of the world. Not so common, evidently, since these trees are so laden with fruit, they are practically begging for someone, anyone, to come pick them.