Independent: Children love snow, of course. But at the height of the recent white-out, when the unaccustomed blizzard had closed schools and stopped all London buses and trapped motorists in their cars at the sides of motorways, I met a grown-up who was also rubbing his hands in glee. He was Tony Kirkham, the head of the arboretum at the Royal Botanic Gardens, Kew. Tony is the man who is actually in charge of the gardens at Kew Gardens, and he was delighted with the thick white blanket — nine …