Farther north, on an office building in King’s Cross, the first of 100,000 honey bees are waking from their winter rest above the skyline of cranes and the new glass roof of St Pancras. Their first food will be from the early rosemary flowers blooming on the next-door roof, lovingly tended by Stuart Robertson, building manager of Wolff Olins, who shows off his beds of alpine strawberries, Swiss chard and onions. They are used by the cooks in the canteen below, and on Friday afternoons screen-weary office workers swap spreadsheets for muddy fingers and help Stuart out in the Gardening Club.