At the end of a winding tree-lined driveway, this grand country house appears suddenly, like a dame at a ball. The late Victorian-era mansion, set in 66 acres of prime Hampshire parkland and gardens, certainly makes a statement. When you step through the entrance archway onto the marble floor, you’re greeted with floor-to-ceiling walnut panelling that sweeps up the staircase, overlooked by gilt-framed portraits of past residents. This Grade II-l…