We may earn a commission from links on this page.No one does early 20th-century English country house drama like Julian Fellowes. Before he adapted the form to America with HBO's current cult hit The Gilded Age, he wrote the script for the 2001 Oscar-winning film Godford Park, then rolled those vibes right into Downton Abbey, perhaps the highest peak the upstairs/downstairs subgenre will ever reach. What started as a soapy show about the estate …