It’s the last day of January. A high pitched, instantly recognisable call comes from down in the vale amongst the trees. Possibly it's one of those new Samsung Galaxy phones, though I doubt it. It can’t be a cuckoo, can it? Surely it's too early by about four months. It's a sound that brings back memories of long early summers of childhood, of greenery and big skies. I consult one of my many gardening books and it looks like it might be a wood pigeon pretending to be a cuckoo. Why would a wood pigeon do that?