Jack Hampshire could never say no to a pram. Dozens of prams—otherwise known as buggies or baby carriages—hung in rows from custom-built racks on the walls of his barn. In his large 15th-century manor house, complete with a moat, you couldn’t walk without tripping over a Victorian push-chair or an Edwardian baby carriage. He had at least 10 prams in his bedroom alone, his favorite standing at the end of the bed. Antique dolls waved mutely from some of the prams, but most were empty, and all bore the hand-painted…